如果只希望对消息的部分内容签名，您可以使用Alias、Qname和Xpath来标识消息的该部分(本文不包括此选项)。

If you want only part of the message to be signed, you can identify that part of the message using Alias, QName, and XPath (this option is not included in this article).

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说明：标识类或接口的所有已声明成员的集合。不包括继承成员。

Identifies the set of declared members of a class or interface. Inherited members are not included.

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