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A globally unique, non-semantic, identifier for the Template. This is the primary identifier for all Templates.

TemplateId is a globally unique reference that can be used by look-up services and registries in an international distributed computing environment, and can be stored within each instance as a permanent record of the knowledge artefact to which it conforms.


  • The constraint applies from the "point of occurrence" (of the templateId attribute) in the model. A sender can assert any templateID anywhere they like. It can be ignored by receivers.
  • There's no reason to prohibit the declaration of any templates at all, because the declaration of non-recognized templates has no impact on the receiver. Prohibiting custom templates would be similar to prohibiting local extensions, which you're also not allowed to do.
  • If an application rejects a message because that message contains a template the application doesn't recognize, that application would be considered non-conformant.
  • (discussion)The use of specific templateId may be constrained, see Constraints on infrastructureRoot attributes