docs: def get_relationship_admin_session(self):
          """Gets the ``OsidSession`` associated with the relationship administration service.
  
          return: (osid.relationship.RelationshipAdminSession) - a
                  ``RelationshipAdminSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_relationship_admin()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_relationship_admin()`` is ``true``.*
  
          """
          if not self.supports_relationship_admin():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.RelationshipAdminSession(runtime=self._runtime)