使用不具转换功能的样式表 — 实际上指不执行任何操作但回转所接收的输入内容的样式表 — 称作 标识转换（identity transformation）。

Using a non-transforming stylesheet—essentially a stylesheet that does nothing but echo out what it receives as input—is called an identity transformation.

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该代理将输入资料注入到管道中，然后在资料经目标物件最初生成接著由行为进一步修改后，该代理接收任何返回值。

The proxy injects input data into the pipeline and receives any return value as initially generated by the target object and then further modified by behaviors.

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