Accessibility Metadata Sells Books: What Distributors and Libraries Actually Read
A publisher can spend months making an EPUB accessible and still lose the sale. The reason is often small. The buyer never saw the proof, because the product record said nothing about it.
Who reads it, and why
Distributors, library suppliers and university procurement teams rarely open the book file. They work from the product record. Libraries and universities increasingly filter titles by accessibility before a purchase order goes out. If the record is silent, the title gets treated as inaccessible, and a competitor with a complete record gets the order. Nobody at the buying end sends a query asking whether the book is accessible. They simply move on to the next title.
What the record needs to say
Two layers matter. Inside the EPUB package, schema.org properties describe the file: accessMode, accessibilityFeature, accessibilityHazard and a plain-language accessibility summary. A conformsTo statement names the standard the file meets, such as EPUB Accessibility 1.1 with WCAG 2.x Level AA. Outside the file, ONIX 3.0 carries the same facts in the product feed that reaches retailers, aggregators and library platforms.
The two layers must agree. A buyer who sees one claim in the feed and another in the file stops trusting both.
Where it goes wrong
Three failures show up again and again.
The blank record. The book is accessible, but nobody filled in the fields. Retailers and libraries see nothing and assume the worst.
The overclaim. A record declares full conformance because a validator returned no errors. Validators catch structural faults. They cannot judge whether alt text describes the image or whether the reading order makes sense. When a library finds the gap, the damage lands on the publisher's name.
The record that never leaves the file. The metadata sits inside the EPUB, but the ONIX feed was built from an older template and omits it. The work was done, and no buyer can see it.
Why the pressure is rising
The European Accessibility Act has applied to e-books since June 2025, and sellers into the EU now need to show what they supply. Library consortia and institutional buyers in North America and the UK ask for the same detail in tenders. A publisher at Frankfurt this week will hear the question at the stand: what can you tell me about the accessibility of this title?
A five-minute test
Pick one frontlist title. Open the EPUB package file and look for the accessibility properties. Then pull the same title from your ONIX feed. Check three things. Is every field filled in? Do the claims match the file? Does the summary say something a librarian could act on, in sentences rather than codes?
If any answer is no, the title is losing visibility it has earned.
Where S4Carlisle fits
Metadata is easy to treat as an afterthought, and it is where accessibility work either pays off or disappears. S4Carlisle builds the accessibility properties into EPUB production, checks the claims against what the file actually does, and aligns the ONIX feed so the record and the book say the same thing. With Benetech GCA certification and more than 50 years in publishing, our team knows both sides of the file: how it is made and how buyers read it.
Bring a title to Hall 4.1, Stall F30 and we will check its record with you. To book a slot, visit
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