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[System]

Herewith the document that I introduced to you today. I would particularly welcome comments from the high level modellers and context methodology group (Tim?, Eve?) on the placement of the ASN.1 extensibility ellipses. This is something that should be determined in the high-level logical model, but never is! (The ellipses are essential for compact binary encodings, as they indicate where "foreign" material can be inserted and has to be length-delimited. For XML encodings it is possible to assume their presence everywhere, but that is inefficient, and reduces the ability of validators to diagnose erroneous documents.) The yellow highlighting will be addressed and removed as soon as the main modelling work becomes stable. John L -- Prof John Larmouth Larmouth T&PDS Ltd (Training and Protocol Development Services) 1 Blueberry Road Bowdon j.larmouth@salford.ac.uk Cheshire WA14 3LS Tel: +44 161 928 1605 England Fax: +44 161 928 8069