Expression Constraint Language

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The SNOMED CT Expression Constraint Language enables simple queries over SNOMED CT content to be expressed. These queries may be performed for a range of purposes, including the authoring and quality assurance of new SNOMED CT content, the design and development of extensional reference sets, and the design and display of SNOMED CT subsets in clinical user interfaces. While the language itself does not support querying over the full EHR content, the SNOMED CT Expression Constraint Language could be embedded within record-based query languages (such as SQL) to represent the terminological aspects of these queries.