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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.

Future-proofing XMP identification schema

September 2025 by Peter Wyatt
Article


ISO standardized subsets of PDF, such as PDF/UA, enable files to claim conformance to a specific version of PDF/UA using XMP-based PDF/UA identification metadata. As a result of changes in … Read more

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September 2025 by PDF Association staff
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According to Board chair Raf Hens: “The event showcased what makes the PDF ecosystem unique: a standards-driven, industry-wide collaboration where … Read more

Article

August 2025 by Jacob Mellor (Iron Software)
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This article is written from my perspective as a lifelong software engineer and current CTO who codes differently – first … Read more

Article

July 2025 by Peter Wyatt
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We were asked to investigate non-functional internal document (intra-document) hyperlinks in PDFs stored on Google Drive and viewed with Google’s … Read more

Article

July 2025 by Paul Rayius (Allyant)
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Experience since PDF/UA-1 was published has revealed that some rules were too prescriptive. In some situations the semantic significance of … Read more

Article

June 2025 by Patrick Gallot (Datalogics)
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PDF has long relied on Flate for general-purpose data compression. Today, Brotli has emerged as a promising new approach that … Read more

Article

June 2025 by Patrick Gallot (Datalogics)
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This article explains the options in allowing, limiting, and/or preventing data scraping from occurring when AI and text data mining … Read more

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June 2025 by PDF Association staff
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In support of the International Archives Week theme and its four subthemes, the PDF Association is announcing its forthcoming Best … Read more

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May 2025 by PDF Association staff
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Announcing the Monday keynote speaker for PDF Days Europe 2025, the new poster sessions and Peter Wyatt’s PDF Workshop!

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April 2025 by Duff Johnson
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What does it take to build the organizational skills and resources necessary to succeed in ensuring PDF documents are accessible?

Article

March 2025 by Robin Watts (Artifex Software Inc)
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Brotli compression is coming soon to PDF 2.0, enabling smaller file sizes. Sample PDF files are available to kickstart development!

Article

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