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The Expression Constraint Language is a formal syntax for representing SNOMED CT expression constraints. Expression constraints are computable rules used to define a bounded sets of clinical meanings represented by either precoordinated or postcoordinated expressions. Expression constraints can be used to restrict the valid values for a data element in an EHR, as the intensional definition of a concept-based reference set, as a machine processable query that identifies a set of matching expressions, or as a constraint that restricts the range of an attribute defined in the SNOMED CT concept model.

Web browsable version: http://snomed.org/ecl

SNOMED CT Document Library: http://snomed.org/doc



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titleSNOMED CT
Expression Constraint Language
Specification and Guide
wip-spaceWIPECL
doc-spaceDOCECL
linkhttp://snomed.org/ecl
pdf-namexdoc_ExpressionConstraintLanguage_v1.x-en-US_INT_YYYYMMDD.pdf
versionVersion 1.3
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