Template slots should be able to be constrained to only permit a specific type of value (e.g. only allowing precoordinated concepts to replace a slot).
Requirement D.34: Template value constraints
Templates slots should be able to be constrained to only permit values from a specific value set (e.g. only allowing expressions that satisfy a given expression constraint).
Requirement D.45: Repeatability of template components
Templates should support a way of indicating how many times each focus concept, relationship group and attribute value pair can be repeated when the template is populated.