sct-ecl

The SNOMED CT Expression Constraint Language.

A logos lexer and a winnow parser faithful to the official ECL ANTLR grammar (the ECL specification), a syntax tree named after the grammar's rules, a printer whose output parses back to the same tree, and an evaluator that compiles a constraint to set algebra over a concept-graph.

Where it sits

sct-ecl 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-ecl.

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.