HL7 Templates

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HL7 Templates

• Charlie McCay
• charlie_at_ramseysystems.co.uk

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Agenda

• What does an HL7 template look like?How can an
  HL7 template be used?
• What about ADL / OWL / etc
• What should be done in HL7UK

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What does an HL7 template look like?

• Any other static model
• Eg CCR and CDA
• Eg Clinical statement model
• Eg NPfIT Model patterns

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Static Models what are they

• HL7v3 messages and CDA
• Visio diagrams / HMDs
• Issues
• Fixed / Final attributes
• Derivation History
• Interface / stubs
• Formal Naming
• Datatype constraints

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How can an HL7 template be used?

• Modellers only
• Assist in modelling process
• Regression testing and validation of models
• Implementation
• Runtime optimisation (eg clinical statement in
  NPfIT)
• Contingent Runtime (eg this is a Lab Test in PoC)
• Content determined constraints (battery contents)
• Futures
• Models as knowledge base
• Standards conformance (send as balloted messages)

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CCR and CDA

• HL7.org funded proof of concept project
• HL7 / ASTM co-ordination
• Feeding into NLM activity
• Detailed presentation on HL7.org website
• Example messages

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CCR as a constraint on CDA
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CCR as a template on CDA
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Clinical Statement Model
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Static Model Issues

• Fixed / Final attributes
• Ease model development
• Derivation History
• Not supported in current tools (except
  rsMIFeditor)
• Interface / stubs
• Wrappers and pointers back to parent model
• Formal Naming
• In Visio tools errors (Choices/
• Datatype constraints

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OWL / ADL / etc

• These are implementation technologies
• Ballot document will be turned into appendixes

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Template issues

• Order significant?
• TemplateId
• what should the root(s) be
• Reduced form in instances?
• Allow non-deterministic content
• How to publish templates
• How to publish models that use templates

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Next steps

• Static model
• (Tooling) Issues as listed above
• Tools to compare / report against static model
• Clinical examples
• Validation tooling
• One pass