Every time a tag is opened or closed, or any time the parser sees some text, it makes callbacks to some user-defined functions with the node or text information.
每次打开或关闭一个标记时，或者每次解析器看到文本时，就用节点或文本的信息回调用户定义的函数。
Section 3 takes the extracted schema file and writes it to the broker's local file system using a user-defined file output node.
第3部分获取提取的模式文件，并使用用户定义的File输出节点将其写入到代理的本地文件系统。
User-defined extensions are another way in which you can write code to run as a node within Message Broker.
用户定义扩展是在 Message Broker 中编写作为节点运行的代码的另一种方法。
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