The XPath expression pointing to the root element of document, that will contain the signature. Can be specified when the SignatureFormat is SignatureFormatCreaDoc. When ommited and SignatureFormat is SignatureFormatCreaDoc, the <cd:Document> must be the root of InputDocument.
Requires CreaSign Pro (not supported by CreaSign Lite).
PrepareSignatureRQ Class | CreaSign Namespace
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