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The template processing requirements include:

 Requirement P.1: Processable input data

Input data must be available, which can be automatically processed with the template to populate the slots with values. Input data must be clear (either explicitly or implicitly) as to which slot it is intended to populate, and whether multiple values are intended to be used within the same relationship group, the same expression (but different relationship groups), or different expressions.

Requirement P.2: Post-processing validity of constraints

After template processing, the resulting language instance (e.g. expression) must be valid against the cardinality, slot type and value constraints that were defined in the template.

Requirement P.3: Post-processing syntactic validity

After template processing, the resulting language instance (e.g. expression) must conform to the ABNF syntax of the associated base language (e.g. SNOMED CT compositional grammar).

Requirement P.4: Post-processing concept model validity

After template processing, the resulting language instance (e.g. expression) should be valid according to the concept model rules defined by the relevant MRCM.

Requirement P.5: Post-processing use case validity

After template processing, the resulting language instance (e.g. expression) should conform to all additional rules that are imposed by the relevant use case. For example, if an expression template is being used to author precoordinated concepts, then the resulting expression must not use nested values (to enable representation in RF2).