The schema has been moved to its own repository so unit tests could be added. This makes sure the schema actually works for known microformats2 parser outputs.
Find the repository at: Zegnat/microformats2-json-schema and the latest version of the schema JSON on at ./schema.json
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@rosskarchner, I honestly do not think this factual JSON file is copyrightable. But you may consider it public domain under CC0 1.0 Universal just like any contribution I have made to microformats.org (see microformats copyrights) and to the PHP parser (see LICENSE).