I know we discussed this on Tuesday's call, but I am really struggling with why I would ever want to do it. It seems to me it is an accident waiting to happen. A type is an abstract reusable thing, I have no idea where it will end up being used, so it is positively dangerous for a discriminator to appear. What is it discriminating? Answer: any surrounding point of uncertainty, no matter where that might be. Please can someone provide me with a real use case for this? Regards Steve Hanson Architect, IBM Data Format Description Language (DFDL) Co-Chair, OGF DFDL Working Group IBM SWG, Hursley, UK smh@uk.ibm.com tel:+44-1962-815848 Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU