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。
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。
This step is necessary because the XML signature is enveloped within the XFDL document being signed.
这一步是必需的，因为XML签名被封装在已签名的XFDL文档的内部。
This step is necessary because the XML signature is enveloped within the XFDL document being signed.
这一步是必需的，因为XML签名被封装在已签名的XFDL文档的内部。
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