Why isn't multithreading adopted for parsing XNode and constructing MappedStatement here?

[yx-Yaoxaing]

    for (XNode context : list) {
      final XMLStatementBuilder statementParser = new XMLStatementBuilder(configuration, builderAssistant, context,
          requiredDatabaseId);
      try {
        statementParser.parseStatementNode();
      } catch (IncompleteElementException e) {
        configuration.addIncompleteStatement(statementParser);
      }
    }
  } ```



  Why isn't multithreading adopted for parsing XNode and constructing MappedStatement here?