It looks as though we didn't properly consider dfdl:NumberBase when defining the number representation properties as they mostly assume base 10. dfdl:numberBase should be ignored if textNumberRepresentation is 'zoned' The dfdl:textNumberFormat properties which are really only for decimal numbers so perhaps dfdl:NumberBase should be moved out. The alternative is to say which of the dfdl:textNumberFormat properties apply when dfdl:numberBase is not '10' 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