Big news from from the world of accessibility metadata: W3C just annouced the release of the Accessibility Metadata Display Guide for Digital Publications 2.1. These guidelines are the result of the work of the Accessibility Task Force of the W3C Publishing Community Group with key input from Fondazione LIA: Gregorio Pellegrino, LIA’s Chief Accessibility Officer, is co-editor of the document.

This guide helps implementers (such as bookstores, retailers, distributors, and libraries) present machine-readable accessibility metadata in clear, user-friendly ways, enabling users to understand whether a digital publication meets their accessibility needs before purchase or use. The guide is also useful for content creators and publishers who wish to understand how their accessibility metadata is exposed to end users.

What it is new in version 2.1

The Guidelines document includes some clarifications and incremental improvements in version 2.1, but no significant changes. The high-level principles for displaying accessibility metadata remain stable, ensuring continuity.

The main updates in version 2.1 are in the EPUB and ONIX Techniques documents, which include important refinements to improve implementation clarity and localization support.

A key enhancement in this release is the introduction of placeholders to insert values from the metadata into display strings. Previous versions used concatenation to build strings using static and dynamic components, but this caused localization issues due to differences in sentence structure across languages. The new approach improves flexibility in how accessibility information is presented, makes localization easier and more accurate across languages, for example, dates can be presented according to the local conventions instead of being hard coded for one region.

To support this change, the JSON files containing the display terms have been updated accordingly, and the techniques documents explain how to construct user-facing strings using the new placeholder-based model.

The importance of these changes

For implementers, version 2.1 provides clearer and more robust techniques without requiring changes to existing guideline-based user interfaces, while significantly improving support for high-quality localization.

For users, especially in non-English contexts, these changes enable clearer, more natural presentation of accessibility information, supporting better-informed discovery and purchasing decisions.

The documents are available at:

• Guidelines: www.w3.org/publishing/a11y/metadata-display-guide/guidelines
• EPUB Techniques: www.w3.org/publishing/a11y/metadata-display-guide/techniques/epub
• ONIX Techniques: www.w3.org/publishing/a11y/metadata-display-guide/techniques/onix

You can provide feedback by opening issues in the Publishing Community Group GitHub issue tracker: github.com/w3c/publ-a11y/issues