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• An expression containing a single

  Gloss
  PreSpace false t concept identifier

  is referred to as a

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  PreSpace false t precoordinated expression

  . An expression that contains two or more

  Gloss
  PreSpace false t concept identifiers

  is a

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  PreSpace false t postcoordinated expression

  .
• The syntax used to represent SNOMED CT expressions is called the 

  Gloss
  t SNOMED CT compositional grammar

   and is formally defined in the Compositional Grammar - Specification and Guide.
• The

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  PreSpace false t concept identifiers

  in a

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  PreSpace false t postcoordinated expression

  are related to one another in accordance with rules expressed in the

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  PreSpace false t SNOMED CT Concept Model

  . These rules allow an expression to

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  PreSpace false t refine

  the meaning of a

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  PreSpace false t concept

  by applying more specific values to particular attributes of a more general

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  PreSpace false t concept

  .

Example

• The expression  Conceptt284196006 284196006:363698007=770850006 represents 770850006 represents a burn to the skin of the left index finger. 

• An expression can also include the terms related to each of the identified concepts as shown below:

  Scg expression
  Indent 30 Border solid
  284196006|burn of skin|:363698007|finding site|=770850006|Skin structure of left index finger|

  
  

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