Compositional Grammar

Search

SNOMED CT Document Library

    Loading...

Versions Compared

Old Version 4

changes.mady.by.user Linda Bird

Saved on

compared with

New Version Current

changes.mady.by.user Linda Bird

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Expressions must conform to the rules defined by the SNOMED CT concept model, or be transformable into an expression that conforms to the SNOMED CT concept model. For example, expressions with a clinical finding that is refined using the attribute

scg-expression
Concept
t272741003|Laterality|
, can be transformed into a conformant expression by applying the laterality to every lateralizable body structure within the definition of the clinical finding. Please note that expressions may either conform to the international SNOMED CT concept model, or a local (e.g. national) extension to the concept model. For more information please refer to For more information please refer to section 12.3.17 and section 12.4.15 of the Terminology Services Guide.

...

The logical model must support the following capabilities:

Function

Details

Concept reference

The ability to reference a precoordinated SNOMED CT concept using its identifier and optional human-readable term.

Intersection / Conjunction

The ability to connect two focus concepts via a logical AND operator.

Refinement

The ability to refine (or specialise) the meaning of an expression using one or more attributes values.

Attribute group

The ability to group a collection of attributes which operate together as part of a refinement.

Attribute

An attribute-value pair which further refines the meaning of the expression

Nesting

The ability to include an expression as the value of an attribute

Concrete values

The ability to use integers, decimals, strings and strings booleans as attribute values

Definition status

The ability to specify whether the clinical meaning is 'equivalent to' or a 'subtype of' the expression.

...