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https://issues.apache.org/jira/browse/TIKA-4442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17986022#comment-17986022
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Peter Hoogendijk commented on TIKA-4442:
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For the 6 tags that were missing, it is what I expected, but now I noticed that 
the "dc:subject" tag contains the wrong data: it shows a list with the data 
from the following tags:
 * pdf:docinfo:subject (from the pdf metadata)
 * pdf:docinfo:keywords (from the pdf metadata)
 * pdf:keywords (from the xmp metadata)

And it is missing the data from the following tags:
 * dc:subject (from the xmp metadata)

When looking at the XML for my testfile (see attachment) the xmp metadata 
contains the correct "dc:subject" and "pdf:keywords" but:
 * Tika shows the wrong data in "dc:subject" (from the xmp metadata)
 * Tika does not show "pdf:keywords" (from the xmp metadata)
 * Tika does not show the actual "dc:subject" (from the xmp metadata)

But going back to Tika 3.2.0 this also happens, so it is not related to this 
TIKA-4442 issue. Do you want me to file a separate issue?

> PDFParser does not list all metadata extracted by PDFBox
> --------------------------------------------------------
>
>                 Key: TIKA-4442
>                 URL: https://issues.apache.org/jira/browse/TIKA-4442
>             Project: Tika
>          Issue Type: Improvement
>          Components: parser
>    Affects Versions: 3.2.0
>         Environment: * Docker container based on python:3-slim
>  * Debian 12.11
>  * Python 3.13.5
>  * openjdk 17.0.15 2025-04-15
>  * tika-server-standard-3.2.0.jar
>  * pdfbox-app-3.0.5.jar
>  * PyPDF 5.6.1
>            Reporter: Peter Hoogendijk
>            Priority: Major
>         Attachments: lorem-ipsum.pdf, lorem-ipsum.xml
>
>
> While using Apache Tika to extract metadata from PDF files, I found the 
> following XMP metadata entries to be missing:
>  * dc:identifier
>  * dc:language
>  * dc:publisher
>  * dc:relation
>  * dc:source
>  * dc:type
> Python (PyPDF2) and PDFBox (as used by Tika's PDFParser) do show these XMP 
> metadata entries, so I expected Apache Tika to also extract these entries.



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