Definition
Matterhorn Protocol
The industry checklist enumerating PDF/UA conformance as concrete checkpoints — divided into machine-verifiable checks (what automated tools test) and human-judgment items (like whether reading order makes sense).
Published by the PDF Association, Matterhorn is why different checkers agree: they implement the same checkpoint list. The machine/human split is also the honest boundary of automation — tools verify structure exists and is well-formed; humans judge whether it's right.
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