This node USES XPath exclusively for its message processing transformation language.
该节点只使用XPath作为其消息处理转换语言。
The client can request a message transformation by stipulating a processing rule on the GET request.
客户机可以通过在GET请求上规定的处理规则来请求消息转换。
Like a cascading style sheet, this type of processing instruction is optional, even for a transformation tool.
与级联样式表相似，这种类型的处理指令是可选的，甚至对于转换工具来说也是这样。
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