When writing a PDF/A-1b (possibly also at other times) pdfwrite emits a xapMM:DocumentID in the XML metadata. This is specified to be a URI, but we emit it as a straight UUID, the hex string should be prefixed with 'uuid:'
Add customer ID. Up priority to P2
Fixed with revisions: g0b7cd7c: http://ghostscript.com/pipermail/gs-cvs/2011-June/013002.html and g7de54e5: http://ghostscript.com/pipermail/gs-cvs/2011-June/013006.html