sct-scg

The SNOMED CT Compositional Grammar: the syntax post-coordinated expressions are written in.

A logos lexer and a winnow parser faithful to the normative ABNF of the Compositional Grammar specification, a syntax tree named after the grammar's rules, and a printer whose output parses back to the same tree. Every parse failure carries the byte offset of the token the grammar does not admit.

The crate is syntax only. It resolves no concept identifier, checks no concept model, and decides no subsumption; an expression it parses may still name a concept an edition does not have.

Where it sits

sct-scg is one crate of FerroTERM, a pure-Rust FHIR terminology server for SNOMED CT, LOINC, and other clinical code systems. The crates are published so other projects can reuse them; the API is pre-1.0 and moves with the FerroTERM release train. Documentation: https://docs.rs/sct-scg.

Licence

Business Source License 1.1 (LICENSE): free to read, build, modify, and redistribute, free for non-production use and for non-commercial production use; commercial production use needs a licence from the Licensor; each version becomes Apache License 2.0 four years after it is published. Clinical terminology content (SNOMED CT, LOINC, RxNorm, ICD, the Dutch national code systems) is licensed by its publisher and is never part of this crate.