My program produces a multiple-pages PDF/A files using iText API. I have two problems about this: 1.I have no idea that the PDF file does not come with both "xmpMM:DocumentID" and "xmpMM:InstanceID" tags in root metadata. I tried to add both tags into root metadata by XmpMMSchema, but it seems like doesnot support the field 'xmpMM:InstanceID'. 2. I think iText generates UUID for each PDF/A file, right? Is there a way to extract it out?
Does anyone here know how to do that?