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Semantic Mapping and HL7

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1 Semantic Mapping and HL7

2 Why Mapping? HL7 have built UML semantic models of healthcare (RIM, RMIMs, CDA…) If everybody migrated to these models, many interoperability problems would be solved Suppliers cannot do this; they have big commitments to other models and structures They could map to the HL7 models; mapping is much easier than migrating So HL7 needs to publish shareable mappings to existing standards and data structures

3 Why Semantic Mapping? To Handle Structure Clashes Most mapping tools only map data values These are the leaves of message trees Structure clashes (e.g. multiplicity) arise on non-leaf nodes, deep in the trees Most mapping tools dont address them Therefore the translations dont work So people drop the tools and hand-code Message A Message B mappings

4 Structure Clashes Arise from Associations Deep message A represents the association X=>Y by nesting of elements Shallow message B represents the same association by shared key values This causes a structure clash You cannot translate from A to B without knowing how they each represent the same association Therefore semantic mapping is needed, to drive accurate translations Message A Message B Class X Class Y UML Class Model object association property association

5 Mappings in Progress Pharmacy V2-V3 (Pharmacy TC) Various V2-V3 (ItalTBS) HIPAA X12 to V3 (FM TC) CCR – CCD (various vendors) Relational database – V3 (basic demonstrator)

6 Example: CCR and CCD CCD and CCR are complex structures (typical nesting depth: 6 – 12) They have many structure clashes (CCR uses shared keys) They have both been mapped to a CCD semantic model (a few days work for CCR) The mappings give accurate translations and round trips – translating thousands of data items Mapping exposes the problems in CCR

7 Mappings for ARRA/HITECH CCR V Application Database Application Database Application Database NCPDP HIPAA X12 Application Data Model CDA + Templates V3 RMIM

8 Benefits and Issues Mappings reveal the problems clearly and early Any-to-any translations can be generated from the mappings (=>rapid testing) By mapping an application data model to CDA, you will get translations to and from CDA, V2.5.1, CCR …. Managing templates is a big problem Versions are a big problem

9 Semantic Mappings - Summary Declarative, simple where they can be simple, viewable (e.g. Excel) A specification for semantic interoperability Auto-generate runnable transformations N*(N-1) transformations from N sets of mappings Rapidly testable (=> test-driven mapping) Mapping exposes semantic problems (gaps, ambiguities)

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