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
scg-expression .
Scg expression |
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Border | ridge |
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ShowFormat | block |
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|
(95617006|Neonatal cyanosis|) ===
(3415004|Cyanosis|+ 363696006|Neonatal cardiovascular disorder|:
246454002|Occurrence|= 255407002|Neonatal|,
363698007|Finding site|= 113257007|Structure of cardiovascular system|) |
Figure 6 illustrates this concept definition using the SNOMED CT Diagramming Guideline.
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In this second example, the definition of the primitive concept
scg-expression is shown:
Scg expression |
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Border | ridge |
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ShowFormat | block |
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|
(144008|Normal peripheral vision|) <<< (301980006|Finding of visual field|:
363698007|Finding site|= 49549006|Structure of visual system|) |
Figure 7 illustrates this concept definition using the SNOMED CT Diagramming Guideline.
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In this last example, the equivalence of two expressions is defined (as illustrated in Figure 8):
Scg expression |
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Border | ridge |
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ShowFormat | block |
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|
(49601007 |Disorder of cardiovascular system|: 246454002|Occurrence| = 255407002|Neonatal|)
=== (64572001|Disease|: 246454002|Occurrence| = 255407002|Neonatal|,
363698007|Finding site|= 113257007|Structure of cardiovascular system|) |
Figure 8: Diagram showing the equivalence of two
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expressions