Enveloped signature: The element becomes a child element of the data being signed.

封内签名（Enveloped signature）： 元素成为被签名数据的子元素。

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Calling the sign method with an XPath argument where the digital signature is to be placed in the document helps create an enveloped signature.

调用带有XPath参数的sign方法，并且数字签名放置在文档中，则生成封内签名。

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Enveloped signatures are performed over data within the same XML document as the signature, so a detached signature is over data that is external to the signature's element itself.

对在签名的同一个XML文件内的资料执行封装式签名，所以对于签名元素本身以外的资料还有一个分离签名。

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