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Duplicating bug 2632 for schema 1.0. See bug 2632 for details.
An erratum (E1-56) resolving this issue was approved (with modifications) by the XML Schema WG at its meeting of 9 July 2010. The modified erratum was published in the 1.0 Second Edition errata document at http://www.w3.org/2004/03/xmlschema-errata.html on 19 August 2010. For background and details, see the minutes of 9 July 2010 http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2010Jul/att-0015/2010-07-09telcon.html (member-only link) and materials linked to from those minutes.
Just for the record: two bugs against XDM (and possibly more that I haven't found) seem to be tied up with this topic: Bug 2630 [DM] Default values of elements and Bug 5319 [DM] Default value now well-defined for mixed content. We hope the resolution of this bug and the issuance of the erratum will be helpful to QT in finally laying those bugs to rest.