docs: def get_response_record(self, item_record_type):
          """Gets the response record corresponding to the given ``Item`` record ``Type``.
  
          This method is used to retrieve an object implementing the
          requested record. The ``item_record_type`` may be the ``Type``
          returned in ``get_record_types()`` or any of its parents in a
          ``Type`` hierarchy where ``has_record_type(item_record_type)``
          is ``true`` .
  
          arg:    item_record_type (osid.type.Type): an item record type
          return: (osid.assessment.records.ResponseRecord) - the response
                  record
          raise:  NullArgument - ``item_record_type`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  Unsupported - ``has_record_type(item_record_type)`` is
                  ``false``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          if not self.has_record_type(item_record_type):
              raise errors.Unsupported()
          if str(item_record_type) not in self._records:
              raise errors.Unimplemented()
          return self._records[str(item_record_type)]