When creating a PDF/A file from ps, gs inserts a xapMM:DocumentID. In both Linux and Windows 9.04 versions of ghostscript, the generated UUID seems to be malformatted, resulting in an invalid XMP metadata package. Here are two examples of the XML element containing the DocumentID: <rdf:Description rdf:about='' xmlns:xapMM='http://ns.adobe.com/xap/1.0/mm/' xapMM:DocumentID='uuid:801a53b2-35fb-11e1-0000-40218ee2ada(»¥Òc'/> <rdf:Description rdf:about='' xmlns:xapMM='http://ns.adobe.com/xap/1.0/mm/' xapMM:DocumentID='uuid:62012087-6bd0-11ec-0000-40218ee2adaœ†ýÿ'/> The first line is from a PDF/A created with GPL Ghostscript 9.04 (2011-08-05) under Win XP, the second created by the same version under Linux AMD64. The problem doesn't exist in 8.71 (didn't test other versions), here the uuid seems to be nice, only lacking the "uuid:" prefix. So maybe this problem is caused by the patch to fix #692268 - http://bugs.ghostscript.com/show_bug.cgi?id=692268 PS: Best wishes for the new year :-) !
*** This bug has been marked as a duplicate of bug 692422 ***