docs: def get_rubric_id(self):
          """Gets the ``Id`` of the rubric.
  
          return: (osid.id.Id) - an assessment taken ``Id``
          raise:  IllegalState - ``has_rubric()`` is ``false``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for osid.resource.Resource.get_avatar_id_template
          if not bool(self._my_map['rubricId']):
              raise errors.IllegalState('this AssessmentTaken has no rubric')
          else:
              return Id(self._my_map['rubricId'])