# Extensions

## Summary

|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            ### Enumerations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| [AndroidXRPermission](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission)`{` ` `[SceneUnderstandingCoarse](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_sceneunderstandingcoarse)` = 0,` ` `[SceneUnderstandingFine](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_sceneunderstandingfine)` = 1,` ` `[HandTracking](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_handtracking)` = 2,` ` `[EyeTrackingCoarse](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_eyetrackingcoarse)` = 3,` ` `[EyeTrackingFine](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_eyetrackingfine)` = 4,` ` `[FaceTracking](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_facetracking)` = 5,` ` `[BodyTracking](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission_bodytracking)` = 9` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | enum Permissions required by Android XR tracking services.                                |
| [XRAvatarSkeletonJointID](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid)`{` ` `[Invalid](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_invalid)` = 0,` ` `[BeginMarker](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_beginmarker)` = 1,` ` `[Hips](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_hips)` = BeginMarker,` ` `[Spine](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_spine)`,` ` `[Ribs](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_ribs)`,` ` `[Chest](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_chest)`,` ` `[Neck](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_neck)`,` ` `[Head](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_head)`,` ` `[LeftShoulder](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftshoulder)`,` ` `[RightShoulder](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightshoulder)`,` ` `[LeftUpperArm](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftupperarm)`,` ` `[RightUpperArm](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightupperarm)`,` ` `[LeftLowerArm](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftlowerarm)`,` ` `[RightLowerArm](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightlowerarm)`,` ` `[LeftHand](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_lefthand)`,` ` `[RightHand](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_righthand)`,` ` `[LeftUpperLeg](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftupperleg)`,` ` `[RightUpperLeg](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightupperleg)`,` ` `[LeftLowerLeg](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftlowerleg)`,` ` `[RightLowerLeg](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightlowerleg)`,` ` `[LeftFoot](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_leftfoot)`,` ` `[RightFoot](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_rightfoot)`,` ` `[LeftToes](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_lefttoes)`,` ` `[RightToes](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_righttoes)`,` ` `[EndMarker](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid_endmarker) `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | enum Represents the type of an skeleton joint.                                            |
| [XRFaceConfidenceRegion](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceconfidenceregion)`{` ` `[Lower](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceconfidenceregion_lower)` = 0,` ` `[LeftUpper](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceconfidenceregion_leftupper)` = 1,` ` `[RightUpper](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceconfidenceregion_rightupper)` = 2` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | enum This is an enumeration of the face confidence regions.                               |
| [XRFaceParameterIndices](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices)`{` ` `[BrowLowererL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_browlowererl)` = 0,` ` `[BrowLowererR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_browlowererr)` = 1,` ` `[CheekPuffL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheekpuffl)` = 2,` ` `[CheekPuffR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheekpuffr)` = 3,` ` `[CheekRaiserL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheekraiserl)` = 4,` ` `[CheekRaiserR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheekraiserr)` = 5,` ` `[CheekSuckL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheeksuckl)` = 6,` ` `[CheekSuckR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_cheeksuckr)` = 7,` ` `[ChinRaiserB](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_chinraiserb)` = 8,` ` `[ChinRaiserT](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_chinraisert)` = 9,` ` `[DimplerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_dimplerl)` = 10,` ` `[DimplerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_dimplerr)` = 11,` ` `[EyesClosedL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyesclosedl)` = 12,` ` `[EyesClosedR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyesclosedr)` = 13,` ` `[EyesLookDownL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookdownl)` = 14,` ` `[EyesLookDownR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookdownr)` = 15,` ` `[EyesLookLeftL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookleftl)` = 16,` ` `[EyesLookLeftR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookleftr)` = 17,` ` `[EyesLookRightL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookrightl)` = 18,` ` `[EyesLookRightR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookrightr)` = 19,` ` `[EyesLookUpL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookupl)` = 20,` ` `[EyesLookUpR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_eyeslookupr)` = 21,` ` `[InnerBrowRaiserL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_innerbrowraiserl)` = 22,` ` `[InnerBrowRaiserR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_innerbrowraiserr)` = 23,` ` `[JawDrop](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_jawdrop)` = 24,` ` `[JawSidewaysLeft](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_jawsidewaysleft)` = 25,` ` `[JawSidewaysRight](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_jawsidewaysright)` = 26,` ` `[JawThrust](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_jawthrust)` = 27,` ` `[LidTightenerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lidtightenerl)` = 28,` ` `[LidTightenerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lidtightenerr)` = 29,` ` `[LipCornerDepressorL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipcornerdepressorl)` = 30,` ` `[LipCornerDepressorR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipcornerdepressorr)` = 31,` ` `[LipCornerPullerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipcornerpullerl)` = 32,` ` `[LipCornerPullerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipcornerpullerr)` = 33,` ` `[LipFunnelerLB](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipfunnelerlb)` = 34,` ` `[LipFunnelerLT](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipfunnelerlt)` = 35,` ` `[LipFunnelerRB](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipfunnelerrb)` = 36,` ` `[LipFunnelerRT](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipfunnelerrt)` = 37,` ` `[LipPressorL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lippressorl)` = 38,` ` `[LipPressorR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lippressorr)` = 39,` ` `[LipPuckerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lippuckerl)` = 40,` ` `[LipPuckerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lippuckerr)` = 41,` ` `[LipStretcherL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipstretcherl)` = 42,` ` `[LipStretcherR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipstretcherr)` = 43,` ` `[LipSuckLB](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipsucklb)` = 44,` ` `[LipSuckLT](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipsucklt)` = 45,` ` `[LipSuckRB](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipsuckrb)` = 46,` ` `[LipSuckRT](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipsuckrt)` = 47,` ` `[LipTightenerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_liptightenerl)` = 48,` ` `[LipTightenerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_liptightenerr)` = 49,` ` `[LipsToward](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lipstoward)` = 50,` ` `[LowerLipDepressorL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lowerlipdepressorl)` = 51,` ` `[LowerLipDepressorR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_lowerlipdepressorr)` = 52,` ` `[MouthLeft](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_mouthleft)` = 53,` ` `[MouthRight](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_mouthright)` = 54,` ` `[NoseWrinklerL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_nosewrinklerl)` = 55,` ` `[NoseWrinklerR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_nosewrinklerr)` = 56,` ` `[OuterBrowRaiserL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_outerbrowraiserl)` = 57,` ` `[OuterBrowRaiserR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_outerbrowraiserr)` = 58,` ` `[UpperLidRaiserL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_upperlidraiserl)` = 59,` ` `[UpperLidRaiserR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_upperlidraiserr)` = 60,` ` `[UpperLipRaiserL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_upperlipraiserl)` = 61,` ` `[UpperLipRaiserR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_upperlipraiserr)` = 62,` ` `[TongueOut](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_tongueout)` = 63,` ` `[TongueLeft](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_tongueleft)` = 64,` ` `[TongueRight](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_tongueright)` = 65,` ` `[TongueUp](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_tongueup)` = 66,` ` `[TongueDown](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfaceparameterindices_tonguedown)` = 67` `}` | enum This is an enumeration of the blendshape values in the Google default vector format. |
| [XRFaceTrackingStates](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfacetrackingstates)`{` ` `[Paused](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfacetrackingstates_paused)`,` ` `[Stopped](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfacetrackingstates_stopped)`,` ` `[Tracking](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfacetrackingstates_tracking) `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | enum This is an enumeration of the possible face tracking states.                         |
| [XRFoveationLevel](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfoveationlevel)`{` ` `[None](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfoveationlevel_none)` = 0,` ` `[Low](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfoveationlevel_low)` = 1,` ` `[Medium](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfoveationlevel_medium)` = 2,` ` `[High](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrfoveationlevel_high)` = 3` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | enum Enum corresponding to`XrFoveationLevelFB`.                                           |
| [XRMarkerDictionary](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary)`{` ` `[ArUco4x4_50](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco4x4_50)` = 0,` ` `[ArUco4x4_100](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco4x4_100)` = 1,` ` `[ArUco4x4_250](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco4x4_250)` = 2,` ` `[ArUco4x4_1000](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco4x4_1000)` = 3,` ` `[ArUco5x5_50](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco5x5_50)` = 4,` ` `[ArUco5x5_100](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco5x5_100)` = 5,` ` `[ArUco5x5_250](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco5x5_250)` = 6,` ` `[ArUco5x5_1000](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco5x5_1000)` = 7,` ` `[ArUco6x6_50](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco6x6_50)` = 8,` ` `[ArUco6x6_100](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco6x6_100)` = 9,` ` `[ArUco6x6_250](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco6x6_250)` = 10,` ` `[ArUco6x6_1000](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco6x6_1000)` = 11,` ` `[ArUco7X7_50](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco7x7_50)` = 12,` ` `[ArUco7X7_100](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco7x7_100)` = 13,` ` `[ArUco7X7_250](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco7x7_250)` = 14,` ` `[ArUco7X7_1000](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_aruco7x7_1000)` = 15,` ` `[AprilTag_16H5](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_apriltag_16h5)` = 16,` ` `[AprilTag_25H9](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_apriltag_25h9)` = 17,` ` `[AprilTag_36H10](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_apriltag_36h10)` = 18,` ` `[AprilTag_36H11](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmarkerdictionary_apriltag_36h11)` = 19` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | enum Describes the type of Supported marker dictionaries.                                 |
| [XRMeshSemantics](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics)`{` ` `[OTHER](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics_other)` = 0,` ` `[FLOOR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics_floor)` = 1,` ` `[CEILING](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics_ceiling)` = 2,` ` `[WALL](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics_wall)` = 3,` ` `[TABLE](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrmeshsemantics_table)` = 4` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | enum An enum representing the vertex semantics of a scene mesh.                           |
| [XRObjectLabel](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrobjectlabel)`{` ` `[Unknown](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrobjectlabel_unknown)` = 0,` ` `[Keyboard](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrobjectlabel_keyboard)` = 1,` ` `[Mouse](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrobjectlabel_mouse)` = 2,` ` `[Laptop](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrobjectlabel_laptop)` = 3` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | enum Describes the type of object that the system has identified.                         |
| [XRPassthroughCameraStates](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrpassthroughcamerastates)`{` ` `[Disabled](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrpassthroughcamerastates_disabled)` = 0,` ` `[Initializing](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrpassthroughcamerastates_initializing)` = 1,` ` `[Ready](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrpassthroughcamerastates_ready)` = 2,` ` `[Error](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrpassthroughcamerastates_error)` = 3` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | enum Defines possible passthrough camera states.                                          |
| [XRSceneMeshTrackingState](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrscenemeshtrackingstate)`{` ` `[INITIALIZING](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrscenemeshtrackingstate_initializing)` = 0,` ` `[TRACKING](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrscenemeshtrackingstate_tracking)` = 1,` ` `[WAITING](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrscenemeshtrackingstate_waiting)` = 2,` ` `[ERROR](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrscenemeshtrackingstate_error)` = 3` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | enum An enum representing the scene mesh tracking state.                                  |
| [XrInputModality](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality)`{` ` `[Unknown](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_unknown)` = 0,` ` `[Hand](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_hand)` = 1,` ` `[Controller](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_controller)` = 2,` ` `[Mouse](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_mouse)` = 3,` ` `[Eye](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_eye)` = 4,` ` `[HmdFallback](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_hmdfallback)` = 5,` ` `[DwellWithHead](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_dwellwithhead)` = 6,` ` `[DwellWithEye](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrinputmodality_dwellwitheye)` = 7` `}`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | enum The input modality state of the system.                                              |

|                                                                            ### Typedefs                                                                             ||
|--------------------------------------------------------------------------------------------------------------------|-------------------------------------------------|
| [PoseControl](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#posecontrol) | using `UnityEngine.XR.OpenXR.Input.PoseControl` |
| [TrackableId](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#trackableid) | using `UnityEngine.XR.ARSubsystems.TrackableId` |

|                                                                                                                                                                                                                                                                                                                                                  ### Classes                                                                                                                                                                                                                                                                                                                                                  ||
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| |
| [Google.XR.Extensions.ARTrackedImageExtensions](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/ARTrackedImageExtensions)                 | Extensions to AR Foundation's`ARTrackedImage`class.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.ARTrackedObjectExtensions](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/ARTrackedObjectExtensions)               | Extensions to AR Foundation's`ARTrackedObject`class.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [Google.XR.Extensions.AndroidXRHumanBodySubsystem](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRHumanBodySubsystem)           | The Android XR implementation of the`XRHumanBodySubsystem`so it can work seamlessly with`ARHumanBodyManager`.                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [Google.XR.Extensions.AndroidXRImageTrackingSubsystem](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRImageTrackingSubsystem)   | The Android XR implementation of the XRImageTrackingSubsystem so it can work seamlessly with ARTrackedImageManager.                                                                                                                                                                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.AndroidXRMouseInteractionProfile](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRMouseInteractionProfile) | This OpenXRInteractionFeature enables the use of Android XR Mouse interaction profile in OpenXR.                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [Google.XR.Extensions.AndroidXRObjectTrackingSubsystem](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRObjectTrackingSubsystem) | The Android XR implementation of the`XRObjectTrackingSubsystem`so it can work seamlessly with`ARTrackedObjectManager`.                                                                                                                                                                                                                                                                                                                                                                                                         |
| [Google.XR.Extensions.AndroidXRPermissionExtensions](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRPermissionExtensions)       | Helper class for[AndroidXRPermission](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission).                                                                                                                                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.AndroidXRPermissionUtil](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRPermissionUtil)                   | Utility component to help manage runtime permission requests.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [Google.XR.Extensions.AndroidXRRuntimeImageLibrary](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRRuntimeImageLibrary)         | Constructs a RuntimeReferenceImageLibrary which stores reference images for Marker Tracking and QR Code trackng at Android XR devices.                                                                                                                                                                                                                                                                                                                                                                                         |
| [Google.XR.Extensions.AndroidXRSessionSubsystem](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/AndroidXRSessionSubsystem)               | The Android XR implementation of the`XRSessionSubsystem`so it can work seamlessly with`ARSession`.                                                                                                                                                                                                                                                                                                                                                                                                                             |
| [Google.XR.Extensions.XRAvatarSkeletonJointIDUtility](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRAvatarSkeletonJointIDUtility)     | Utility class for[XRAvatarSkeletonJointID](https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xravatarskeletonjointid).                                                                                                                                                                                                                                                                                                                                                                   |
| [Google.XR.Extensions.XRBodyTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRBodyTrackingFeature)                       | This`OpenXRInteractionFeature`configures Android XR extensions`XR_ANDROIDX_body_tracking`at runtime and provides`XRHumanBodySubsystem`implementation that works on Android XR platform.                                                                                                                                                                                                                                                                                                                                        |
| [Google.XR.Extensions.XREnvironmentBlendModeFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XREnvironmentBlendModeFeature)       | This`OpenXRInteractionFeature`configures` XrEnvironmentBlendMode` ` at OpenXR runtime. `                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [Google.XR.Extensions.XRFaceTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRFaceTrackingFeature)                       | This`OpenXRInteractionFeature`configures new extension                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [Google.XR.Extensions.XRFaceTrackingManager](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRFaceTrackingManager)                       | This class provides the current eye information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [Google.XR.Extensions.XRFoveationFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRFoveationFeature)                             | This`OpenXRInteractionFeature`configures the` XR_FB_foveation` ` extension at OpenXR runtime. `                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [Google.XR.Extensions.XRHandMeshFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRHandMeshFeature)                               | This feature provides access to the`XR_ANDROID_hand_mesh`extension.                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.XRHumanBodyProportions](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRHumanBodyProportions)                     | Defines the human body proportions to be used for computing the rest pose skeleton.                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.XRMarkerDatabase](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRMarkerDatabase)                                 | A marker database is a collection of[XRMarkerDatabaseEntry](https://developer.android.com/develop/xr/unity/reference/struct/Google/XR/Extensions/XRMarkerDatabaseEntry#structGoogle_1_1XR_1_1Extensions_1_1XRMarkerDatabaseEntry)which stores marker information used to configure marker tracking at runtime when[XRMarkerTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRMarkerTrackingFeature#classGoogle_1_1XR_1_1Extensions_1_1XRMarkerTrackingFeature)is enabled. |
| [Google.XR.Extensions.XRMarkerTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRMarkerTrackingFeature)                   | This OpenXRInteractionFeature configures Android XR extensions`XR_ANDROID_trackables`and`XR_ANDROID_trackables_marker`at runtime and provides XRImageTrackingSubsystem implementation that works on Android XR platform.                                                                                                                                                                                                                                                                                                       |
| [Google.XR.Extensions.XRMeshSubsystemExtension](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRMeshSubsystemExtension)                 | Extensions to AR Foundation's`XRMeshSubsystem`class.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [Google.XR.Extensions.XRObjectTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature)                   | This`OpenXRInteractionFeature`configures Android XR extensions`XR_ANDROID_trackables`and`XR_ANDROID_trackables_object`at runtime and provides XRObjectTrackingSubsystem implementation that works on Android XR platform.                                                                                                                                                                                                                                                                                                      |
| [Google.XR.Extensions.XRPassthroughFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRPassthroughFeature)                         | This`OpenXRInteractionFeature`configures the`XR_ANDROID_composition_layer_passthrough_mesh`and`XR_ANDROID_passthrough_camera_state`extensions at OpenXR runtime and provides passthrough geometry capabilities in the OpenXR platform.                                                                                                                                                                                                                                                                                         |
| [Google.XR.Extensions.XRPassthroughLayerData](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRPassthroughLayerData)                     | Example of defining a layer data script for a passthrough layer.                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [Google.XR.Extensions.XRQrCodeTrackingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRQrCodeTrackingFeature)                   | This OpenXRInteractionFeature configures Android XR extensions`XR_ANDROID_trackables`and`XR_ANDROID_trackables_qr_code`at runtime and provides XRImageTrackingSubsystem implementation that works on Android XR platform.                                                                                                                                                                                                                                                                                                      |
| [Google.XR.Extensions.XRSceneMeshingFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRSceneMeshingFeature)                       | This feature provides access to the`XR_ANDROID_scene_meshing`extension.                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [Google.XR.Extensions.XRSessionFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRSessionFeature)                                 | This`OpenXRInteractionFeature`provides Android XR session management for all extended Android XR features, and common session configurations.                                                                                                                                                                                                                                                                                                                                                                                  |
| [Google.XR.Extensions.XRSystemStateFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRSystemStateFeature)                         | This[XRSystemStateFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRSystemStateFeature#classGoogle_1_1XR_1_1Extensions_1_1XRSystemStateFeature)provides a function to query the system state information at runtime.                                                                                                                                                                                                                                                              |
| [Google.XR.Extensions.XRUnboundedRefSpaceFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRUnboundedRefSpaceFeature)             | This[XRUnboundedRefSpaceFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRUnboundedRefSpaceFeature#classGoogle_1_1XR_1_1Extensions_1_1XRUnboundedRefSpaceFeature)makes the`UNBOUNDED`reference space available in this app and can be used by setting the`XRInputSubsystem`tracking origin mode.                                                                                                                                                                                  |

|                                                                                                                                                                                                                                                             ### Structs                                                                                                                                                                                                                                                              ||
|----------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Google.XR.Extensions.XRFaceState](https://developer.android.com/develop/xr/unity/reference/struct/Google/XR/Extensions/XRFaceState)                     | This struct contains the blendshape parameter weights, current status of the face tracker and face joint poses.                                                                                                                                                                                                                                                            |
| [Google.XR.Extensions.XRMarkerDatabaseEntry](https://developer.android.com/develop/xr/unity/reference/struct/Google/XR/Extensions/XRMarkerDatabaseEntry) | Represents an entry in an[XRMarkerDatabase](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRMarkerDatabase#classGoogle_1_1XR_1_1Extensions_1_1XRMarkerDatabase)with the specialized information that can be converted into a marker XRReferenceImage, then used at ARTrackedImageManager.referenceLibrary for runtime configuration. |
| [Google.XR.Extensions.XrSystemState](https://developer.android.com/develop/xr/unity/reference/struct/Google/XR/Extensions/XrSystemState)                 | Contains system state information.                                                                                                                                                                                                                                                                                                                                         |

## Enumerations

### AndroidXRPermission

```c#
 AndroidXRPermission
```  
Permissions required by Android XR tracking services.

|                                                                          Properties                                                                          ||
|--------------------------|------------------------------------------------------------------------------------------------------------------------------------|
| BodyTracking             | Permission to enable body tracking.                                                                                                |
| EyeTrackingCoarse        | Permission to enable coarse eye tracking.                                                                                          |
| EyeTrackingFine          | Permission to enable eye gaze interaction and fine eye tracking.                                                                   |
| FaceTracking             | Permission to enable face tracking.                                                                                                |
| HandTracking             | Permission to enable hand tracking.                                                                                                |
| SceneUnderstandingCoarse | Permission to enable coarse scene understanding features that relies on motion tracking, ToF sensor, and the VST RGB-left cameras. |
| SceneUnderstandingFine   | Permission to enable fine scene understanding features that relies on motion tracking, such as depth texture and scene meshing.    |

### XRAvatarSkeletonJointID

```c#
 XRAvatarSkeletonJointID
```  
Represents the type of an skeleton joint.

If you wish to convert it to an index, Use XRAvatarSkeletonJointIDUtility.ToIndex(XRAvatarSkeletonJointID) on the joint ID.

|                                                                                                                  Properties                                                                                                                  ||
|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| BeginMarker   | Marks the beginning of joints, or start of an array of data related to them. Casting this to an integer type will not result in a correct start. Use XRAvatarSkeletonJointIDUtility.ToIndex(XRAvatarSkeletonJointID) instead. |
| Chest         | Joint for the chest.                                                                                                                                                                                                          |
| EndMarker     | Marks the end of joints, or size of an array of data related to them. Casting this to an integer type will not result in a correct count. Use XRAvatarSkeletonJointIDUtility.ToIndex(XRAvatarSkeletonJointID) instead.        |
| Head          | Joint for the head.                                                                                                                                                                                                           |
| Hips          | Joint for hips.                                                                                                                                                                                                               |
| Invalid       | Invalid ID.                                                                                                                                                                                                                   |
| LeftFoot      | Joint for the left foot.                                                                                                                                                                                                      |
| LeftHand      | Joint for the left hand.                                                                                                                                                                                                      |
| LeftLowerArm  | Joint for the left lower arm.                                                                                                                                                                                                 |
| LeftLowerLeg  | Joint for the left lower leg.                                                                                                                                                                                                 |
| LeftShoulder  | Joint for the left shoulder.                                                                                                                                                                                                  |
| LeftToes      | Joint for left toes.                                                                                                                                                                                                          |
| LeftUpperArm  | Joint for the left upper arm.                                                                                                                                                                                                 |
| LeftUpperLeg  | Joint for the left upper leg.                                                                                                                                                                                                 |
| Neck          | Joint for the neck.                                                                                                                                                                                                           |
| Ribs          | Joint for ribs.                                                                                                                                                                                                               |
| RightFoot     | Joint for the right foot.                                                                                                                                                                                                     |
| RightHand     | Joint for the right hand.                                                                                                                                                                                                     |
| RightLowerArm | Joint for the right lower arm.                                                                                                                                                                                                |
| RightLowerLeg | Joint for the right lower leg.                                                                                                                                                                                                |
| RightShoulder | Joint for the right shoulder.                                                                                                                                                                                                 |
| RightToes     | Joint for right toes.                                                                                                                                                                                                         |
| RightUpperArm | Joint for the right upper arm.                                                                                                                                                                                                |
| RightUpperLeg | Joint for the right upper leg.                                                                                                                                                                                                |
| Spine         | Joint for the spine.                                                                                                                                                                                                          |

### XRFaceConfidenceRegion

```c#
 XRFaceConfidenceRegion
```  
This is an enumeration of the face confidence regions.

|                                 Properties                                  ||
|------------|-----------------------------------------------------------------|
| LeftUpper  | The confidence of the accuracy of the left upper face region.   |
| Lower      | The confidence of the accuracy of the lower face region.        |
| RightUpper | TThe confidence of the accuracy of the right upper face region. |

### XRFaceParameterIndices

```c#
 XRFaceParameterIndices
```  
This is an enumeration of the blendshape values in the Google default vector format.

|                             Properties                             ||
|---------------------|-----------------------------------------------|
| BrowLowererL        | Left eyebrow lowerer control parameter.       |
| BrowLowererR        | Right eyebrow lowerer control parameter.      |
| CheekPuffL          | Left cheek puff control parameter.            |
| CheekPuffR          | Right cheek puff control parameter.           |
| CheekRaiserL        | Left cheek raiser control parameter.          |
| CheekRaiserR        | Right cheek raiser control parameter.         |
| CheekSuckL          | Left cheek suck control parameter.            |
| CheekSuckR          | Right cheek puff control parameter.           |
| ChinRaiserB         | Bottom chin raiser control parameter.         |
| ChinRaiserT         | Top chin raiser control parameter.            |
| DimplerL            | Left dimpler control parameter.               |
| DimplerR            | Right dimpler control parameter.              |
| EyesClosedL         | Left eye closed control parameter.            |
| EyesClosedR         | Right eye closed control parameter.           |
| EyesLookDownL       | Left eye look down control parameter.         |
| EyesLookDownR       | Right eye look down control parameter.        |
| EyesLookLeftL       | Left eye look left control parameter.         |
| EyesLookLeftR       | Right eye look left control parameter.        |
| EyesLookRightL      | Left eye look right control parameter.        |
| EyesLookRightR      | Right eye look right control parameter.       |
| EyesLookUpL         | Left eye look up control parameter.           |
| EyesLookUpR         | Right eye look up control parameter.          |
| InnerBrowRaiserL    | Inner left eyebrow raiser control parameter.  |
| InnerBrowRaiserR    | Inner right eyebrow raiser control parameter. |
| JawDrop             | Jaw drop control parameter.                   |
| JawSidewaysLeft     | Jaw moved left control parameter.             |
| JawSidewaysRight    | Jaw moved right control parameter.            |
| JawThrust           | Jaw thrust forward control parameter.         |
| LidTightenerL       | Left lid tightener control parameter.         |
| LidTightenerR       | Right lid tightener control parameter.        |
| LipCornerDepressorL | Lip left corner depressor control parameter.  |
| LipCornerDepressorR | Lip right corner depressor control parameter. |
| LipCornerPullerL    | Lip left corner puller control parameter.     |
| LipCornerPullerR    | Lip right corner puller control parameter.    |
| LipFunnelerLB       | Left bottom lip funnler control parameter.    |
| LipFunnelerLT       | Left top lip funnler control parameter.       |
| LipFunnelerRB       | Right bottom lip funnler control parameter.   |
| LipFunnelerRT       | Right top lip funnler control parameter.      |
| LipPressorL         | Left lip presser control parameter.           |
| LipPressorR         | Left lip presser control parameter.           |
| LipPuckerL          | Left lip pucker control parameter.            |
| LipPuckerR          | Right lip pucker control parameter.           |
| LipStretcherL       | Left lip stretch control parameter.           |
| LipStretcherR       | Right lip stretch control parameter.          |
| LipSuckLB           | Bottom left lip suck control parameter.       |
| LipSuckLT           | Left top suck control parameter.              |
| LipSuckRB           | Bottom right lip suck control parameter.      |
| LipSuckRT           | Right top suck control parameter.             |
| LipTightenerL       | Left lip tightener control parameter.         |
| LipTightenerR       | Right lip tightener control parameter.        |
| LipsToward          | Lips moved together control parameter.        |
| LowerLipDepressorL  | Lower left lip depresser control parameter.   |
| LowerLipDepressorR  | Lower right lip depresser control parameter.  |
| MouthLeft           | Mouth left motion control parameter.          |
| MouthRight          | Mouth right motion control parameter.         |
| NoseWrinklerL       | Left nose wrinkle control parameter.          |
| NoseWrinklerR       | Right nose wrinkle control parameter.         |
| OuterBrowRaiserL    | Outer left eyebrow raiser control parameter.  |
| OuterBrowRaiserR    | Outer right eyebrow raiser control parameter. |
| TongueDown          | Tongue move down control parameter.           |
| TongueLeft          | Tongue move left control parameter.           |
| TongueOut           | Tongue stick out control parameter.           |
| TongueRight         | Tongue move right control parameter.          |
| TongueUp            | Tongue move up control parameter.             |
| UpperLidRaiserL     | Left upper lid raiser control parameter.      |
| UpperLidRaiserR     | Right upper lid raiser control parameter.     |
| UpperLipRaiserL     | Upper left lip depresser control parameter.   |
| UpperLipRaiserR     | Upper left lip depresser control parameter.   |

### XRFaceTrackingStates

```c#
 XRFaceTrackingStates
```  
This is an enumeration of the possible face tracking states.

|                                     Properties                                     ||
|----------|--------------------------------------------------------------------------|
| Paused   | Indicates that face tracking is paused but may be resumed in the future. |
| Stopped  | Tracking is stopped and is currently not tracking.                       |
| Tracking | The face is currently tracked and its pose is current.                   |

### XRFoveationLevel

```c#
 XRFoveationLevel
```  
Enum corresponding to`XrFoveationLevelFB`.

|                                                           Properties                                                           ||
|--------|------------------------------------------------------------------------------------------------------------------------|
| High   | Corresponds to`XR_FOVEATION_LEVEL_HIGH_FB`- High foveation (lower periphery visual fidelity, higher performance).      |
| Low    | Corresponds to`XR_FOVEATION_LEVEL_LOW_FB`- Less foveation (higher periphery visual fidelity, lower performance).       |
| Medium | Corresponds to`XR_FOVEATION_LEVEL_MEDIUM_FB`- Medium foveation (medium periphery visual fidelity, medium performance). |
| None   | Corresponds to`XR_FOVEATION_LEVEL_NONE_FB`- No foveation.                                                              |

### XRMarkerDictionary

```c#
 XRMarkerDictionary
```  
Describes the type of Supported marker dictionaries.

|                                                   Properties                                                   ||
|----------------|------------------------------------------------------------------------------------------------|
| AprilTag_16H5  | The predefined dictionary of AprilTag family 16H5.                                             |
| AprilTag_25H9  | The predefined dictionary of AprilTag family 25H9.                                             |
| AprilTag_36H10 | The predefined dictionary of AprilTag family 36H10.                                            |
| AprilTag_36H11 | The predefined dictionary of AprilTag family 36H11.                                            |
| ArUco4x4_100   | The predefined dictionary in the ArUco module, composed of 100 markers with size of 4x4 bits.  |
| ArUco4x4_1000  | The predefined dictionary in the ArUco module, composed of 1000 markers with size of 4x4 bits. |
| ArUco4x4_250   | The predefined dictionary in the ArUco module, composed of 250 markers with size of 4x4 bits.  |
| ArUco4x4_50    | The predefined dictionary in the ArUco module, composed of 50 markers with size of 4x4 bits.   |
| ArUco5x5_100   | The predefined dictionary in the ArUco module, composed of 100 markers with size of 5x5 bits.  |
| ArUco5x5_1000  | The predefined dictionary in the ArUco module, composed of 1000 markers with size of 5x5 bits. |
| ArUco5x5_250   | The predefined dictionary in the ArUco module, composed of 250 markers with size of 5x5 bits.  |
| ArUco5x5_50    | The predefined dictionary in the ArUco module, composed of 50 markers with size of 5x5 bits.   |
| ArUco6x6_100   | The predefined dictionary in the ArUco module, composed of 100 markers with size of 6x6 bits.  |
| ArUco6x6_1000  | The predefined dictionary in the ArUco module, composed of 1000 markers with size of 6x6 bits. |
| ArUco6x6_250   | The predefined dictionary in the ArUco module, composed of 250 markers with size of 6x6 bits.  |
| ArUco6x6_50    | The predefined dictionary in the ArUco module, composed of 50 markers with size of 6x6 bits.   |
| ArUco7X7_100   | The predefined dictionary in the ArUco module, composed of 100 markers with size of 7x7 bits.  |
| ArUco7X7_1000  | The predefined dictionary in the ArUco module, composed of 1000 markers with size of 7x7 bits. |
| ArUco7X7_250   | The predefined dictionary in the ArUco module, composed of 250 markers with size of 7x7 bits.  |
| ArUco7X7_50    | The predefined dictionary in the ArUco module, composed of 50 markers with size of 7x7 bits.   |

### XRMeshSemantics

```c#
 XRMeshSemantics
```  
An enum representing the vertex semantics of a scene mesh.

|                     Properties                      ||
|---------|--------------------------------------------|
| CEILING | Represents a vertex on the ceiling.        |
| FLOOR   | Represents a vertex on the floor.          |
| OTHER   | Represents a vertex with unknown semantic. |
| TABLE   | Represents a vertex on the table.          |
| WALL    | Represents a vertex on the wall.           |

### XRObjectLabel

```c#
 XRObjectLabel
```  
Describes the type of object that the system has identified.

|                     Properties                     ||
|----------|------------------------------------------|
| Keyboard | The object is a keyboard.                |
| Laptop   | The object is a laptop.                  |
| Mouse    | The object is a mouse.                   |
| Unknown  | It was not possible to label the object. |

### XRPassthroughCameraStates

```c#
 XRPassthroughCameraStates
```  
Defines possible passthrough camera states.

|                                  Properties                                   ||
|--------------|-----------------------------------------------------------------|
| Disabled     | The camera has been disabled by an app, the system or the user. |
| Error        | The camera is in an unrecoverable error state.                  |
| Initializing | The camera is still coming online and not yet ready to use.     |
| Ready        | The camera is ready to use.                                     |

### XRSceneMeshTrackingState

```c#
 XRSceneMeshTrackingState
```  
An enum representing the scene mesh tracking state.

|                                                      Properties                                                      ||
|--------------|--------------------------------------------------------------------------------------------------------|
| ERROR        | The internal tracker has not received valid measurements for multiple cycles and is in an error state. |
| INITIALIZING | The internal tracker is not yet ready to provide mesh data.                                            |
| TRACKING     | The internal tracker is actively tracking.                                                             |
| WAITING      | The internal tracker is waiting for valid measurements to integrate since the last mesh update.        |

### XrInputModality

```c#
 XrInputModality
```  
The input modality state of the system.

|                   Properties                   ||
|---------------|---------------------------------|
| Controller    | Controller input modality.      |
| DwellWithEye  | Dwell with eye input modality.  |
| DwellWithHead | Dwell with head input modality. |
| Eye           | Eye input modality.             |
| Hand          | Hand input modality.            |
| HmdFallback   | HMD fallback input modality.    |
| Mouse         | Mouse input modality.           |
| Unknown       | Unknown input modality.         |

## Typedefs

### PoseControl

```c#
UnityEngine.XR.OpenXR.Input.PoseControl PoseControl
```  

### TrackableId

```c#
UnityEngine.XR.ARSubsystems.TrackableId TrackableId
```