code: def get_children(self):
          
          # Implemented from template for osid.learning.Activity.get_assets_template
          if not bool(self._my_map['childIds']):
              raise errors.IllegalState('no childIds')
          mgr = self._get_provider_manager('REPOSITORY')
          if not mgr.supports_composition_lookup():
              raise errors.OperationFailed('Repository does not support Composition lookup')
  
          # What about the Proxy?
          lookup_session = mgr.get_composition_lookup_session(proxy=getattr(self, "_proxy", None))
          lookup_session.use_federated_repository_view()
          return lookup_session.get_compositions_by_ids(self.get_child_ids())
docs: Gets the children of this composition.
  
          return: (osid.repository.CompositionList) - the composition
                  children
          raise:  OperationFailed - unable to complete request
          *compliance: mandatory -- This method must be implemented.*