A general CodeSystem query language aka ECL for FHIR
summary
Proposal defines a compact, URI-friendly ECL-like language (VCL) for querying any FHIR CodeSystem, with an alpha implementation in OntoServer and examples against LOINC and RxNorm. Analysis of ~15,000 uploaded ValueSets finds ~5,500 use filter expressions, motivating features: hierarchy traversal, path navigation through properties, membership by ValueSet URI and regex term matches. Term/designation filtering remains unresolved, current prototype omits some modifiers and multi–code-system support but demonstrates practical implicit ValueSet URIs and dynamic, on‑the‑fly queries.
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chapters (8)
- 0:00Introduction
- 1:04Speaker background
- 4:16ECL for FHIR introduction
- 7:02Design goals for VCL
- 12:28VCL syntax and examples
- 17:10Open issues and proposals
- 18:58Implementation status
- 19:39Q&A
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