Page History

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In 2013, a draft document on "SNOMED CT Expression Constraint Syntax Specification for Terminology Binding"  was was developed as an assignment during for the SNOMED CT Implementation Advisor (SIA) scheme.

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Most significantly, version 2.0 is the first version of ECL that is specifically designed to support querying over historical patient records, which may contain inactive codes.

In July 2022, version 2.1 was published to allow description filters to filter results using description identifiers, and to harmonise the dialect alias filter (see Appendix C) with BCP-47 (Internet Best Current Practice Specification).

For a full list of previous PDF versions and a summary of updates, please refer to Previous Versions. 

Audience

The target audiences of this document include:

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