Extended Reality (xR) is an umbrella term that includes AR, VR, and MR experiences.
Location is the place in which an xR experience occurs as well as the environment, including the orientation and time in which it occurs. Location may be available and change at any angle, anywhere, on any device (to allow interaction of many actors or users at the same time). Location may refer to a generalized representation and concept of location which is based on many dimensions: geo-location, depth, orientation, time, rights, etc. Location may include a physical place (territory, region, building, interior, space), a virtual place, or a combination of both physical and virtual places. Location may be impacted based on the social aspects of a xR experience and actors participating in such xR experience (e.g., who else is in the experience, where are they, etc.).
Localizer Service refers to a service responsible for tracking and mapping the xR experience against the surfaces and geometries of the location.