Open issues
  - Adding more semantics to RDF-SIG
    
      - Timestamping (when did someone said what, validity period)
 
      - This could also be useful for XML-SIG
 
      - Some of these semantics could be expressed with an XML binding and
        reused in XML-SIG
 
      - XML-SIG becomes a subset of a richer RDF-SIG
 
    
   
  - Good RDF C14N
    
      - How to serialize? RDF/XML, n-triplets, N3, ... ?
 
      - Jeremy Carrol's RDF
        C14N work
 
      - Named graphs (Chris
        Bizer, TRIX)
 
      - SW P2P (Giovanni
        Tummarello)
 
      - Blank nodes naming