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SNOMED CT expression constraint language version 1.5 has been published at http://snomed.org/ecl.
Implementations
The SLPG SNOMED International is aware of the following implementations of the SNOMED CT Expression Constraint Language:
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- Support for moduleId and caseSignificantId
- Support for effectiveTime (exact and ranges), semanticTag (exact and regex), namespace and refset attributes.
- Regular expression and exact term matching
- Conjunction, disjunction and exclusion at all levels of the query, and multiple queries can be connected together
- Query nesting - Filters that accept concept SCTIDs, any ECL query, so more complex queries can be created and evaluated
- See https://github.com/b2ihealthcare/snomed-ql and https://github.com/b2ihealthcare/snomed-ql#examples
- Also see https://github.com/b2ihealthcare/snomed-ql/blob/main/com.b2international.snomed.ql/src/com/b2international/snomed/ql/QL.xtext