# 12.38. XR_EXT_user_presence
## Name String
    XR_EXT_user_presence
## Revision
    1
## New Enum Constants
[XrStructureType](https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#XrStructureType) enumeration is extended with:
- XR_TYPE_EVENT_DATA_USER_PRESENCE_CHANGED_EXT
- XR_TYPE_SYSTEM_USER_PRESENCE_PROPERTIES_EXT
## New Structures
- [XrSystemUserPresencePropertiesEXT](https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#XrSystemUserPresencePropertiesEXT)
- [XrEventDataUserPresenceChangedEXT ](https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#XrEventDataUserPresenceChangedEXT)

## VIVE Plugin

Enable "VIVE XR User Presence" in "Project Settings > XR Plugin-in Management > OpenXR > Android Tab > OpenXR Feature Groups" to use the user presence feature provided by VIVE OpenXR plugin.