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New Application Note Illuminates PDF’s Flexible Options for Custom Metadata

October 2025 by PDF Association staff

The PDF Association has released a new Application Note titled “Including Custom Metadata Structures in PDF.”

This document addresses the need for organizations to use custom metadata beyond standard XMP schemas in their PDF workflows. It provides guidance on designing custom metadata schemas, embedding them interoperably, best practices for versioning and extensibility, and strategies for exposing metadata to applications and tools.

The document’s objective is to enhance interoperability and efficiency by allowing custom metadata to travel seamlessly within PDF documents, eliminating the need for separate “sidecar files.”

The Note is now available on the PDF Association website.

The PDF Association has released a new Application Note titled “Including Custom Metadata Structures in PDF.”

This document addresses the need for organizations to use custom metadata beyond standard XMP schemas in their PDF workflows. It provides guidance on designing custom metadata schemas, embedding them interoperably, best practices for versioning and extensibility, and strategies for exposing metadata to applications and tools.

The document’s objective is to enhance interoperability and efficiency by allowing custom metadata to travel seamlessly within PDF documents, eliminating the need for separate “sidecar files.”

The Note is now available on the PDF Association website.

PDF 2.0 support gets top billing in coverage of LibreOffice 25.8

September 2025 by PDF Association staff
PDF in the Wild


Thank you Berlin | PDF 2.0 support gets top billing in coverage of LibreOffice 25.8 | Now Tagged PDF and PDF/UA-2 from ConTeXt | Visual AI is not “parsing” | … Read more

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August 2025 by PDF Association staff
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Encoding multilingual content | The US Library of Congress recognizes individual PDF/A-4 conformance levels | “There was no book” | … Read more

PDF in the Wild

July 2025 by PDF Association staff
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Browsers battle over PDF capabilities | ISO’s “Publicly Available Standards” page is gone | PDF to Brainrot | JHOVE update … Read more

PDF in the Wild

June 2025 by PDF Association staff
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If you use a word processor creating Tagged PDF is your default. | FOGRA’s summary of developments in print | … Read more

PDF in the Wild

May 2025 by PDF Association staff
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Accessibility | veraPDF version 1.28.1 | Chrome PDF features updates | Transparency blending | Screen readers and special characters | … Read more

PDF in the Wild

April 2025 by PDF Association staff
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AI’s Pirated-Books Problem | Correcting US financial regulations referencing PDF | New crawl limit improves CC’s capture of PDF | … Read more

PDF in the Wild

March 2025 by PDF Association staff
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When will AI understand document semantics? | Will LLM-based OCR live up to the challenge? | Indicating whether the publisher … Read more

PDF in the Wild

February 2025 by PDF Association staff
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PDF bookmarks from Google Chrome? | What does “PDF” mean to you? | Two reasons why everyone needs PDF | … Read more

PDF in the Wild

January 2025 by PDF Association staff
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Doom in a PDF | PDF Week Boston 2025 | The EAA is coming! | AI and accessibility standards | … Read more

PDF in the Wild

December 2024 by PDF Association staff
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A close-up look at how PDF does text | What would Patton think? | Word bug blocks PDF/UA validators, Happy … Read more

PDF in the Wild

November 2024 by PDF Association staff
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New guidance on PDF Portable Collections and on digitizing paper. | US Army website features PDF/UA | PDFism! | Scratch-and-sniff … Read more

PDF in the Wild

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