docs: def get_relationships(self):
          """Gets all ``Relationships``.
  
          return: (osid.relationship.RelationshipList) - a list of
                  ``Relationships``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceLookupSession.get_resources
          # NOTE: This implementation currently ignores plenary view
          collection = JSONClientValidated('relationship',
                                           collection='Relationship',
                                           runtime=self._runtime)
          result = collection.find(self._view_filter()).sort('_id', DESCENDING)
          return objects.RelationshipList(result, runtime=self._runtime, proxy=self._proxy)