The latest, and hopefully the last, discriminators write-up which incorporates comments from Steve H and Stephanie. Steve questioned: It is a processing error if none of the choice branches are known to exist. Steve: I know we agreed on this but I?m concerned that I am now unable to model the situation where I have a header, a footer, and in between either nothing or exactly 1 of a choice of n records Also the WG agreed that: Discriminators are not allowed on - Global groups and the top level sequence or choice of a global group. - Global element decalrations - The top level group of a complex type. - Anonymous groups other than when it is the top level of a choice branch. Which I think reduces to dfdl:discriminator can be an annotation on · a local xs:element declaration · an xs:element reference · an xs:group reference · an xs:sequence (when the top level of a choice branch) · an xs:choice (when the top level of a choice branch) Regards Alan Powell Development - MQSeries, Message Broker, ESB IBM Software Group, Application and Integration Middleware Software ------------------------------------------------------------------------------------------------------------------------------------------- IBM MP211, Hursley Park Hursley, SO21 2JN United Kingdom Phone: +44-1962-815073 e-mail: alan_powell@uk.ibm.com 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