2.2.7.1.2.2 DigestValue Element
If a <Reference> element is present, the Signature <DigestValue> element MUST be present exactly once as a child element of the <Reference> element.
The <DigestValue> element contains a hash value based on a single message property preceded by a keyword indicating the message property used to calculate it with the hashing algorithm specified in the <DigestMethod> element. Each digest value is calculated directly from the applicable binary property.
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<DigestValue>XU9yAzfwEPuP7L5iOcQY9XRNEWM=</DigestValue>