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SNOMED International APG Parser

SNOMED CT Expression Template Language

The SNOMED CT expression template language is used to represent SNOMED CT expressions that contain placeholders for values that are not known at the time of authoring. These placeholders (called 'slots') can be completed at a later time using data recorded elsewhere (such as in an information model or entered into a data entry form). Expression templates are used for a variety of purposes, including to define reusable patterns for authoring or validating precoordinated concepts definitions and postcoordinated expressions.

This parser validates an input string according to the ABNF syntax defined for SNOMED CT expression template language v1.0 (

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

The Parser's Output: