PUBLISHED COPY. Source of truth: https://github.com/ExtendedMatrix/s3Dgraphy, spec/em-json/, commit 7b3b904.

Extended Matrix schemas

JSON Schemas of the em.json format, dedicated to the public domain (CC0 1.0).

Schema	What
`em.v1.1.schema.json`	em.json 1.1 — the Extended Matrix container
`em.v1.schema.json`	.em.json v1 (FROZEN 2026-07-11)

Canonical IRIs: https://w3id.org/extendedmatrix/schemas/<name>.