■■ bar
■■ bus
■■ cafe
■■ classroom
■■ club
■■...
■■ Privacy element (the presence info may be intercepted in the vicinity)
■■ audio
■■ text
■■ video
■■ Relationship element
■■ associate
■■ assistant
■■ family
■■ friend
■■ supervisor
■■ self
■■...
■■ Service class
■■ courier
■■ electronic
■■ freight
■■ in-person
■■ postal
■■...
■■ Sphere
■■ home
■■ work
■■ Status icon. Example: http://www.example.com/playing.gif
■■ Time offset (at the person’s current location)Automata-readable rich presence information is extensible for various
applications, though the actual list of elements will be tailored for each specific
application or environment.238 Chapter 13