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In some situations, some parts of a SNOMED CT expression, expression constraint or query are not known unknown at the time of authoring. In these situationssuch cases, the SNOMED CT Template Syntax template syntax may be used , in conjunction with the appropriate language syntax , to represent a template of a specific type. For example:

• Using the Template Syntax template syntax with SNOMED CT Compositional Grammarcompositional grammar enables the representation of ‘Expression Templates’; expression templates
• Using the Template Syntax with template syntax with the SNOMED CT Expression Constraintexpression constraint Language enables the representation of ‘Expression Constraint Templates’; and expression constraint templates

• Using the Template Syntax with template syntax with the SNOMED CT Query Languagequery language

  
  

  Footnote Macro
  Please note that the SNOMED CT

  Query Language

  query language is not yet available.

   enables the representation of ‘Query Templates’. query templates.

This version of the SNOMED CT template syntax specifically focuses on supporting two important use cases in which the SNOMED CT template syntax is needed to represent expression templates. In particular:

• Authoring Pre-coordinated Clinical Concepts
• Defining Post-coordinated Clinical Meanings

In these use cases, the template syntax is applied to SNOMED CT Compositional Grammar to create an Expression Template Language. 

Future versions of the syntax may consider other features designed to support additional use cases for expression Expression templates, expression constraint templates and query templates serve slightly different purposes. The following sections describe the key use cases for each of these template types.

Some of these other use cases are described in Other Use Cases for Expression Templates.