Hi, Ok. Have not that much time to do much with this. It is still very tentative. Would welcome any feedback - constructive or destructive - or even better contributions if people want to pick up the pen. In essence have written a brief introduction, stolen some stuff from the DAIS specs, re-used the DAIS stuff I wrote on a previous occassion but not really updated it. Stole - whole - with slight modificaitons some stuff that Mark and Andrew wrote for GGF13. Still requires much work but it can be a starting point for discussion at the call tomorrow. Mario +-----------------------------------------------------------------------+ |Mario Antonioletti:EPCC,JCMB,The King's Buildings,Edinburgh EH9 3JZ. | |Tel:0131 650 5141|mario@epcc.ed.ac.uk|http://www.epcc.ed.ac.uk/~mario/ | +-----------------------------------------------------------------------+