Possible roles of a user within a group, such as owner or ordinary member. Users subscribed to a group have exactly one role within the context of that group.
|The owner of a group.|
|The manager of a group.|
|A user who is a member of this group but is neither an owner nor a manager.|
|A user who has been invited to join a group by an owner or manager of the group but who has not yet accepted the invitation.|
|A user who has requested to join a group but who has not yet been approved by an owner or manager.|