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fix(organize): Document Properties also change the XMP title and author (#1658)

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`set_info` changed only `/Info`. Files that carry XMP (LibreOffice and Word
exports, PDF/A) kept the old dc:title and dc:creator, so viewers that read
XMP first kept showing the old title, and PDF/A preflight reported the two
as different (6.6.3).

The matching XMP property (Title dc:title, Author dc:creator, Subject
dc:description, Keywords pdf:Keywords, Creator xmp:CreatorTool, Producer
pdf:Producer) is now replaced where it stands, added in a description of
its own, or removed with an empty value. The packet is edited as text and
the rest of it stays byte for byte; files without XMP get none, and a
packet that isn't UTF-8 is left as it was.

Co-authored-by: Claude Opus 5.5 <[email protected]>
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AlexandClaude Opus 5.5 authored and GitHub committed 2026-10-13 00:18:35 -04:00
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commit 9324afaa4f
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docs/pdf-spec-parity.md
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@@ -44,7 +44,7 @@ are borrowed; PDF 2.0 additions and most subset standards are missing. **150–2
| §12.9 | Measurement and geospatial | full | 2D measuring with viewports and calibration; no geospatial | `comment.geospatial` planned |
| §12.10 | Document requirements | yes | none | |
| §13 | Multimedia: sound, movies, screen, rich media, 3D (U3D, PRC) | yes | preserved untouched; not played or shown | `misc.rich-media-*`, `misc.3d-view` planned (P3) |
| §14.3 | Metadata: info dictionary, XMP | full, XMP editor | info dictionary edited; XMP kept in step for PDF/A; no XMP editor or custom properties | `organize.xmp-editor` planned |
| §14.3 | Metadata: info dictionary, XMP | full, XMP editor | info dictionary edited, with its XMP counterparts (title, author, subject, keywords, creator tool, producer) kept in step; XMP written for PDF/A; no XMP editor or custom properties | `organize.xmp-editor` planned |
| §14.6–14.8 | Marked content, logical structure, tagged PDF | full, with editing tools | read (checker, bookmarks from structure, redaction of tags); no tag editing or autotag | gap 11 |
| §14.9 | Accessibility support: alt text, ActualText, language | full | alt text figure by figure, language, title | `a11y.alt-text-workflow` |
| §14.10 | Web capture | yes | none | |