def create_group_data_criteria(preconditions, type, value, parent_id, id, standard_category, qds_data_type)
      extract_group_data_criteria_tree(HQMF::DataCriteria::UNION,preconditions, type, parent_id)
    end
def create_group_data_criteria(preconditions, type, value, parent_id, id, standard_category, qds_data_type)
      extract_group_data_criteria_tree(HQMF::DataCriteria::UNION,preconditions, type, parent_id)
    end
grouping data criteria are used to allow a single reference off of a temporal reference or subset operator
 grouping data criteria can reference either regular data criteria as children, or other grouping data criteria