Beyond Syntax: Syntactico-Semantic JSON Schema Compatibility

William Charles, Nicolas Berne, Maxime Lefrançois and Antoine Zimmermann. Beyond syntax: A syntactico-semantic compatibility approach for JSON schemas. Submitted to the ISWC 2026 Poster and Demo Track.

JSON Schema describes structure, and this library also reasons about meaning when schemas carry x-concept annotations.

Choose a playground below to compare schemas, normalize them, simplify them, or compute meet, join, and neg.

Playgrounds

Home Entry point for the library demos. Compatibility Compare two JSON schemas with semantic reasoning. Canonicalize Normalize a schema into its canonical form. Simplify Turn a canonical schema into an internal checker object. Meet Compute the greatest lower bound of two schemas. Join Compute the least upper bound of two schemas. Neg Compute the logical negation of a schema.

Library resources

Source code Browse the semantic_jsonsubschema GitLab repository. PyPI package Install the published semantic_jsonsubschema package. Documentation Read the hosted user and API documentation.