docs: def execute_xpath(xpath_string, sql_function, uuid, version):
      """Executes either xpath or xpath-module SQL function with given input
      params."""
      settings = get_current_registry().settings
      with db_connect() as db_connection:
          with db_connection.cursor() as cursor:
  
              try:
                  cursor.execute(SQL[sql_function],
                                 {'document_uuid': uuid,
                                  'document_version': version,
                                  'xpath_string': xpath_string})
              except psycopg2.Error as e:
                  exc = httpexceptions.HTTPBadRequest()
                  exc.explanation = e.pgerror
                  raise exc
  
              for res in cursor.fetchall():
                  yield {'name': res[0],
                         'uuid': res[1],
                         'version': res[2],
                         'xpath_results': res[3]}