RE: [ubl-ndrsc] Digital Signatures

Paul Wrote -  
> If there is no authenication, who will trust the UBL 
> documents outside of
> their own organization.  The point of UBL is business to 
> business communication,
> right?


But why does the document itself need to have the digital signature.  I can understand the need for ensuring authentication and non-repudiation, but shouldn't this be a function of the exchange mechanism - such as ebMS - and not the individual payloads?

Mark