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SNOMED International APG Parser

SNOMED CT Expression Constraint Language Parser - Brief Syntax

The SNOMED CT expression constraint language is a computable language used to define a set of SNOMED CT concepts or expressions. Expression constraints are used for a variety purposes, including restricting the valid values of a data element in an electronic health record (EHR), defining intensional subsets, querying SNOMED CT content and restricting the range of an attribute in the SNOMED CT concept model.

This parser validates the input string according to the ABNF brief syntax defined for the SNOMED CT expression constraint language v1.3 ( The brief syntax is the normative syntax for expression constraints, and is recommended for use in interoperable communications between systems.

The Input String: (edit and click "Parse")

The Parser's Output: