TemplateId

See Clarification of use of templateId for ongoing discussions, below is the current understanding.

A globally unique, non-semantic, identifier for the Template. This is the primary identifier for all Templates. TemplateId is an attribute of the InfrastructureRoot class.

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.

Notes:

• 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

Example

The example shows an instance (with ID 373645) of an observation (of type Barthel-index). The observation uses the REPC_MT000103.Barthel_Index template.

<Observation> 
  <templateId root="2.16.840.1.113883.2.1.3.2.4.12" extension="REPC_MT000103.Barthel_Index">
  
  <id codeSystem="2.16.840.1.113883.3.19.4" extension="373645"/>
  <effectiveTime value="200601191211"/>
  <value value="3"/>
  <!-- various bits omitted from this example -->
<Observation/>