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Attributes should not be allowed on package metadata element #1665

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#1714
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Attributes should not be allowed on package metadata element#1665
#1714
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rdeltour
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status: has PRThe issue is being processed in a pull requesttype: false-negativeThis issue is about invalid content being incorrectly accepted
Milestone
v5.4.0

Description

@naglis
naglis
opened on Jun 22, 2026

Hello, the EPUB 3 spec says that the metadata element takes no attributes, however, the RELAX NG schema (and thus, EPUBCheck) allows optional id, dir and xml:lang.

Here is a minimal test EPUB with id, dir and xml:lang attributes that validates without issues with EPUBCheck v.5.3.0 (added .zip extension to allow uploading to GitHub): Package_metadata_attribute_test_publication.epub.zip

It was clarified in w3c/epub-specs#3023 (comment) that this is a bug.

Activity

  1. rdeltour commented on Jun 26, 2026

    @rdeltour
    rdeltour
    on Jun 26, 2026
    Member

    Thanks for the report! I'm adding that to the next maintenance release.

  2. rdeltour
    self-assigned this
    on Jun 26, 2026
  3. rdeltour
    added
    status: ready for implemThe issue is ready to be implemented
    type: false-negativeThis issue is about invalid content being incorrectly accepted
    on Jun 26, 2026
  4. rdeltour
    added this to the Next maintenance release milestone on Jun 26, 2026
  5. rdeltour
    added
    status: in progressThe issue is being implemented by the development team
    status: has PRThe issue is being processed in a pull request
    and removed
    status: ready for implemThe issue is ready to be implemented
    status: in progressThe issue is being implemented by the development team
    on Sep 11, 2026
  6. rdeltour
    closed this as completedin #1714on Sep 15, 2026
  7. rdeltour
    added a commit that references this issue on Sep 15, 2026

    fix: disallow attributes on package 'metadata' element

    4063caa
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