处理类型：SPML同时支持并行和顺序处理请求。

Processing types: SPML supports both sequential and parallel processing of requests.

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有序类型仅仅是指对象的顺序。

A sequence type is just a sequence of objects.

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这一点很重要，该框架将要求一个具有指定类型和特定顺序的XML元素集。

This is important; the framework will expect a certain set of XML elements of specified type and in a particular order.

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