A: 

You mean this one here, in the SQL Server 2005 Books on line...?

Role Class

Represents a role for use in Reporting Services security.

Namespace: ReportService2005 Assembly: ReportService2005 (in reportservice2005.dll)

gbn
I'd hardly class such gems as "Represents a role for use in Reporting Services security" as documentation. Nothing is mentioned regarding methods/properties associated with such an object. Looks like the usual autogenerated Microsoft documentation.
adolf garlic
It's in BOL though, which is what you asked... ;-)
gbn