DigestValue的签名是将资源内容与签名者金钥系结的机制。
The signing of the DigestValue is the mechanism that binds a resource's content to the signer's key.
默认情况下，这个标签名称与您创建的JSP名称是相匹配的，但是这两者不完全一样。
By default, the tag name matches the name of the JSP that you created, but the two do not have to be same.
该识别资料与transforms一起是签名者提供的描述，其内容有关它们如何获得已摘录形式的已签名资料物件(即，已摘录的内容)。
This identification, along with the transforms, is a description provided by the signer on how they obtained the signed data object in the form it was digested (that is, the digested content).
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