scal:AttendeeRole
Predefined set of instances: chain, req-participant...
http://www.w3.org/2000/01/rdf-schema#Resource scal:AttendeeRole
scal:AttendeeRole has the following predefined instances:
scal:attendee-role-non-participant
scal:attendee-role-opt-participant
scal:attendee-role-req-participant
scal:attendee-role-chair