docs: def get_compositions_by_repository(self, repository_id):
          """Gets the list of ``Compositions`` associated with a ``Repository``.
  
          arg:    repository_id (osid.id.Id): ``Id`` of the ``Repository``
          return: (osid.repository.CompositionList) - list of related
                  compositions
          raise:  NotFound - ``repository_id`` is not found
          raise:  NullArgument - ``repository_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceBinSession.get_resources_by_bin
          mgr = self._get_provider_manager('REPOSITORY', local=True)
          lookup_session = mgr.get_composition_lookup_session_for_repository(repository_id, proxy=self._proxy)
          lookup_session.use_isolated_repository_view()
          return lookup_session.get_compositions()