XML Time-sstamp and implied references.

[Juan Carlos Cruellas <cruellas@ac.upc.edu>]

Dear all,

The core document, in its section 5.1.1 mandates that

"For every input document being timestamped, there MUST be a single  
<ds:Reference> element whose URI attribute references the document".

I think that we should not be so restrictive. XMLDSIG allows for 
ds:Reference elements without URI attributes, leaving the applications 
the task of actually retrieving the  documents. My opinion is that we 
should also replicate this behaviour and allowing ds:Reference without 
URI attributes for those situations (like XAdES signatures, for 
instance) where applications making use of the time-stamps already know 
how to get the time-stamped data objects and how to compute the 
messageImprint.

Regards

Juan Carlos.