A serialized representation of a SNOMED CT expression produced by applying a set of rules that ensure a single unique representation for any expression.
Notes
- Expressions that contain exactly the same concept identifiers and refinements, may differ from one another in the following ways:
- Inclusion of whitespace between elements
- Inclusion of specific terms associated with identified concepts.
- The order in which focus concepts, refinements, attributes, and attribute groups appear.
- The canonical form is generated by removing whitespace and terms from an expression and arranging the focus concepts, refinements, attributes, and attribute groups in a standard order.
- If canonical form rules are applied to a normal form expression, the result is a single unique rendering of the meaning represented by that expression.
Related Links
- Normal form
- Compositional Grammar - Specification and Guide
- Terminology Services Guide
- Wikipedia
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