Page History

SNOMED CT Compositional Grammar is a syntax for representing SNOMED CT expressions. SNOMED CT expressions are a structured combination of one or more concept identifiers used to express a clinical idea. When documenting a full concept definition or an expression relationship statement, which asserts the relationship between two expressions, it is often useful to use a syntax that is consistent with SNOMED CT Compositional Grammar. For these purposes, the following ABNF syntax extension may be used:

...

where 'subExpression' and 'definitionStatus' are defined as per SNOMED CT Compositional Grammar.

For example, the following statement documents the definition of the fully defined concept

95617006|Neonatal cyanosis|

   (95617006|Neonatal cyanosis|) ===
      (3415004|Cyanosis|+ 363696006|Neonatal cardiovascular disorder|:
          246454002|Occurrence|= 255407002|Neonatal|,
          363698007|Finding site|= 113257007|Structure of cardiovascular system|)

...

In this last example, the equivalence of two expressions is defined (as illustrated in Figure 8):

   (49601007 |Disorder of cardiovascular system|: 246454002|Occurrence| = 255407002|Neonatal|) 
    === (64572001|Disease|: 246454002|Occurrence| = 255407002|Neonatal|,
         363698007|Finding site|= 113257007|Structure of cardiovascular system|)

...

expressions