Jochen Stärk created PDFBOX-5976:
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Summary: DomXmpParser incorrectly expects namespaces on attribute
level
Key: PDFBOX-5976
URL: https://issues.apache.org/jira/browse/PDFBOX-5976
Project: PDFBox
Issue Type: Bug
Components: XmpBox
Affects Versions: 3.0.4 PDFBox
Reporter: Jochen Stärk
Attachments: AN-10005_v28_2025-03-19-2.pdf,
AN-10005_v28_2025-03-19x-1.pdf
When trying to determine the PDF-A-Version like
{{PDDocument document = null;}}
{{try {}}
{{document = Loader.loadPDF(new File("AN-10005_v28_2025-03-19.pdf"));}}
{{PDDocumentCatalog catalog = document.getDocumentCatalog();}}
{{PDMetadata metadata = catalog.getMetadata();}}
{{DomXmpParser xmpParser = new DomXmpParser();}}
{{XMPMetadata xmp = xmpParser.parse(metadata.createInputStream());}}
{{PDFAIdentificationSchema pdfaSchema = xmp.getPDFAIdentificationSchema();}}
{{if (pdfaSchema != null) {}}
{{System.out.println("It's a PDF A-" + pdfaSchema.getPart());}}
{{}}}
{{document.close();}}
{{} catch (XmpParsingException e) {}}
{{e.printStackTrace();}}
{{} catch (IOException e) {}}
{{e.printStackTrace();}}
{{}}}
on the attached (and valid) PDF A-3b AN-10005_v28_2025-03-19-2.pdf, PDFBox
incorrectly fails with a
{{org.apache.xmpbox.xml.XmpParsingException: Schema is not set in this document
: http://www.aiim.org/pdfa/ns/id/}}
{{ at
org.apache.xmpbox.xml.DomXmpParser.checkPropertyDefinition(DomXmpParser.java:920)}}
{{ at
org.apache.xmpbox.xml.DomXmpParser.parseDescriptionRootAttr(DomXmpParser.java:276)}}
{{ at
org.apache.xmpbox.xml.DomXmpParser.parseDescriptionRoot(DomXmpParser.java:247)}}
{{ at org.apache.xmpbox.xml.DomXmpParser.parse(DomXmpParser.java:201)}}
{{ at de.usegroup.Main.main(Main.java:25)}}
After manipulating the metadata stream with itext RuPS from
{{<rdf:RDF xmlns:pdf="http://ns.adobe.com/pdf/1.3/";
xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/";
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";><rdf:Description
rdf:about="" pdfaid:part="3" pdfaid:conformance="B" /><rdf:Description
rdf:about="" pdf:Producer="WeasyPrint 64.1" /></rdf:RDF>}}
to
{{ <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";>}}
{{ <rdf:Description rdf:about=""}}
{{ xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/"}}
{{ xmlns:pdf="http://ns.adobe.com/pdf/1.3/"}}
{{ xmlns:xmp="http://ns.adobe.com/xap/1.0/"}}
{{ pdfaid:conformance="B"}}
{{ pdfaid:part="3"}}
{{ pdf:Producer="WeasyPrint 64.1; modified using iText® Core 7.2.5 (AGPL
version) ©2000-2023 iText Group NV"}}
{{ xmp:ModifyDate="2025-03-21T08:16:58+01:00"/>}}
{{ </rdf:RDF>}}
putting the namespace definition in the rdf:Description
(AN-10005_v28_2025-03-19x-1.pdf) it works.
The issue is: it should be sufficient to put the namespace definitions in the
root element, "RDF", i.e. the first example should also work.
When searching for similar issues I had the impression this may be similar to
your issue #2219
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