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Subject: SV: [ubl-tsc] [Fwd: [ubl-psc] Proposal for a signature refenrence]
Do I understand you correctly when that ebXML supports a solution where the xml-document and the signature are in the same envelope, but in different payloads?
What I suggest is that the xml-document becomes able to refer to the signature, not only as a URL but also as a Mime reference.
The problem with embeddign the siganture in the xml-document is
1) it becomes invalid if it is transformed to an other document.
2) A digital signature on a xml document is not valid in legal terms. Only a transformation of a xml-document can be brought into a court room.
3) A digital signature with the purpose of ensuring that no one has tampered with the document has nothing to do in a procurement document. This is a matter for the transportation layer.
What is needed at the business level is infomation about whether someone actual has aproved the document. On the other hand, to reference the signature gives you problem with consistency and persistency. This can be solved by adding two more fields in document reference: GaranteeStoragePeriode and Hashcode (perhaps hashmethod as well).
I would like to here more about your requirements.
Peter L. Borresen