Hi, I have created in new document supplement for the support of default and null values in DFDL V1.0. The support for DFDL V1.0 is been simplified and most of the undecided areas have been removed. I have not updated the core and parking lot documents because I want to get agreement that my new document is the right way to go before I update them. Regards, Geoff Judd Websphere MQ Integrator Development IBM United Kingdom Ltd. Hursley Telephone: +44-1962-818461 E-mail: JUDDG@uk.ibm.com