Steve, Tim and I discussed discriminators so more, particularly transferring the WTX model to dfdl. We think we were successful and cam up with the following semantics A dfdl:discriminator resolves the presence of its parent group (sequence or choice). Note this isn't necessarily a point of uncertainty If the parent group is the content model for a complex types then the instance of the element of the complex type also exists (that is: if the group is only defining the content of a complex element then the discriminator propagates from the group to the element automatically) Alan Powell MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com Tel: +44 (0)1962 815073 Fax: +44 (0)1962 816898 ----- Forwarded by Alan Powell/UK/IBM on 09/12/2009 12:51 ----- From: Alan Powell/UK/IBM@IBMGB To: dfdl-wg@ogf.org Date: 24/11/2009 15:50 Subject: [DFDL-WG] DFDL Discriminators discussion Following on from Stephanie's WTX example on last weeks call I think that restricting discriminator to resolving their parents provides the level of control that we need. I have updated Mike's example with this syntax Note I have flattened the schema as I find that easier to read and 'enhanced' some the the dfdl properties. To illustrate the flexibility if 'L' had a test="{ fn:exists( . ) }" discriminator then if an L record had been found then the parse would fail rather than backtracking to Blob. Alan Powell MP 211, IBM UK Labs, Hursley, Winchester, SO21 2JN, England Notes Id: Alan Powell/UK/IBM email: alan_powell@uk.ibm.com Tel: +44 (0)1962 815073 Fax: +44 (0)1962 816898 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 -- dfdl-wg mailing list dfdl-wg@ogf.org http://www.ogf.org/mailman/listinfo/dfdl-wg #### testDiscriminator2.dfdl.xml moved to MyAttachments Repository V3.8 () on 02 December 2009 by Alan Powell. 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