从左向右工作：首先创建您想要使用的第一个原语，并将其连接到输入节点。

Work from left to right: first create the first primitive you intend to use and wire it up to the input node.

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XML输入使用与原语相关的XSL文件进行转换，并将生成一个XML输出。

XML input is transformed using the XSL file associated with the primitive and an XML output is produced.

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映射根确定原语输入消息的哪个部分被用作映射输入，以及原语输出消息的哪个部分用作映射输出。

The mapping root determines which part of the primitive input message is used as the mapping input and which part of the primitive output message is used as the mapping output.

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