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https://issues.apache.org/jira/browse/PDFBOX-2896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635398#comment-14635398
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Maruan Sahyoun commented on PDFBOX-2896:
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A general note. I've put the major change into the XmpSerializer. Before
serializing the attributes have the namespace and namespace prefix of the
scheme they are in. That's also true for other 'base' types such as Alt, Seq
and Bag where already during serializing the RDF namespaces were set regardless
of the elements original namespace.
> XMPBox not creating valid "title" entry in DublinCoreSchema in trunk
> --------------------------------------------------------------------
>
> Key: PDFBOX-2896
> URL: https://issues.apache.org/jira/browse/PDFBOX-2896
> Project: PDFBox
> Issue Type: Bug
> Components: XmpBox
> Affects Versions: 2.0.0
> Reporter: Tim Allison
> Priority: Minor
>
> On TIKA-1678, I was trying to generate a test PDF that had a dc:title in the
> XMP with XMPBox from PDFBox's trunk. I modified the code from CreatePDFA by
> adding this:
> {code}
> DublinCoreSchema dc = xmp.createAndAddDublinCoreSchema();
> dc.setTitle("this is the title");
> {code}
> The generated PDF doesn't appear to have a compliant dc:title entry in the
> XMP.
> [~tilman] noted the divergence from the standard
> [here|https://issues.apache.org/jira/browse/TIKA-1678?focusedCommentId=14634045&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14634045].
> What PDFBox does:
> {code}
> <dc:title>
> <rdf:Alt>
> <dc:li>this is the title</dc:li>
> </rdf:Alt>
> </dc:title>
> {code}
> It should be:
> {code}
> <dc:title>
> <rdf:Alt>
> <rdf:li xml:lang="x-default">this is the title</rdf:li>
> </rdf:Alt>
> </dc:title>
> {code}
> Error message from the PDF-Tools validator:
> {quote}
> 'dc:li' is not allowed in arrays. The elements must be rdf:li or rdf:_N,
> where N is a positive number.
> There is only one RDF resource allowed in XMP.
> {quote}
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