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https://issues.apache.org/jira/browse/PDFBOX-2643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297324#comment-14297324
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Tilman Hausherr commented on PDFBOX-2643:
-----------------------------------------
Sure... Maybe I missed something. I did look at the XMP specification for the
content of InstanceID.
> "XMP type violation in stRef:instanceID" not reported by preflight
> ------------------------------------------------------------------
>
> Key: PDFBOX-2643
> URL: https://issues.apache.org/jira/browse/PDFBOX-2643
> Project: PDFBox
> Issue Type: Sub-task
> Components: Preflight
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Attachments: PDFA_Conference_2009_nc.pdf
>
>
> In the Bavaria test suite, PDFLib claims that the attached file is not a
> valid PDF/A-1b file, because "Property stRef:instanceID in document XMP
> requires scheme identifier" or "XMP type violation in stRef:instanceID" (They
> make both claims in Bavaria.xml).
> {code}
> <rdf:Description rdf:about=""
> xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/";
> xmlns:stRef="http://ns.adobe.com/xap/1.0/sType/ResourceRef#";>
>
> <xmpMM:InstanceID>uuid:b429d411-e628-45ca-b932-d2c77fbe6cd3</xmpMM:InstanceID>
>
> <xmpMM:DocumentID>adobe:docid:indd:db084a4d-dbb2-11dc-ac34-beb3cc4028ec</xmpMM:DocumentID>
> <xmpMM:RenditionClass>proof:pdf</xmpMM:RenditionClass>
> <xmpMM:DerivedFrom rdf:parseType="Resource">
>
> <stRef:instanceID>6544a661-c065-11dc-854c-dd4f35453e8b</stRef:instanceID>
>
> <stRef:documentID>adobe:docid:indd:fa7c6589-9f4a-11dc-9641-af983df728d7</stRef:documentID>
> </xmpMM:DerivedFrom>
> </rdf:Description>
> {code}
> PDF-Tools considers the file to be correct. But according to
> http://www.pdflib.com/fileadmin/pdflib/pdf/pdfa/2009-05-04-Bavaria-report-on-PDFA-validation-accuracy.pdf
> they don't raise the correct alarm for XMP violations. The PDFLib xmp
> checker also considers the XMP to be correct.
> "6544a661-c065-11dc-854c-dd4f35453e8b" does not look like a valid URI to me
> although the regex mentioned at http://tools.ietf.org/html/rfc3986#appendix-B
> thinks it is.
> [~msahyoun] what do you get for that file? The Bavaria Testsuite is already 5
> years old, so maybe Adobe/Callas have improved their product.
> (Another unreported error for that file is "xapGImg:height for xmp:Thumbnails
> in document XMP does not match the actual base64-encoded image data")
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