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Modelling Clinical Information Using UML. Tim Benson Abies Ltd tim.benson@abies.co.uk. Overview. Show how UML class diagrams add value to the HL7 v3 development process Focus is on detailed Requirements specification and data element definitions (Glossary). The Problem.
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Modelling Clinical Information Using UML Tim Benson Abies Ltd tim.benson@abies.co.uk HL7 UK 2003 (c) Abies Ltd
Overview • Show how UML class diagrams add value to the HL7 v3 development process • Focus is on detailed Requirements specification and data element definitions (Glossary) HL7 UK 2003 (c) Abies Ltd
The Problem • HL7 v3 is a foreign language to clinicians • HL7 RMIMs are specialised tools for developing healthcare message XML schemas • Not suited for capturing requirements • Formal class names based on structural attributes • Small number of common attribute names based on the RIM • Pre-defined Data Types and Vocabulary HL7 UK 2003 (c) Abies Ltd
The Solution • Specify message requirements in detail using: • Visual data modelling (UML class diagrams) • Glossary - detailed definition of every data item in context • Then map to HL7 RMIM HL7 UK 2003 (c) Abies Ltd
Iterative Development • HL7 is concerned with the whole process - not just drafting documents HL7 UK 2003 (c) Abies Ltd
Phases HL7 UK 2003 (c) Abies Ltd
HL7 Message Development Framework (MDF) 1999 HL7 UK 2003 (c) Abies Ltd
What is a model? • Two sorts of model: • To describe the real world • Can never be “right” • To design and build things • Specification • Always a simplification HL7 UK 2003 (c) Abies Ltd
Models and Diagrams • Model is all information in a project • Model may include Glossary • Model is much more than a collection of diagrams • Each diagram is just one view on a Model • Most models contain dozens of diagrams HL7 UK 2003 (c) Abies Ltd
Real World Models HL7 UK 2003 (c) Abies Ltd
Specification Models HL7 UK 2003 (c) Abies Ltd
OMG MOF (meta object facility) • M3 meta-metamodel • M2 meta-model, meta-metadata (languages) • M1 model, meta-data (standards) • M0 data (systems) HL7 UK 2003 (c) Abies Ltd
Matrix HL7 UK 2003 (c) Abies Ltd
UML • Unified Modelling Language • Mandated in e-GIF • OMG standard UML 1.1 1997 • Version 1.4 2000 • UML 2.0 2003 • MDA Model Driven Architecture • XMI (XML Metadata Interchange) HL7 UK 2003 (c) Abies Ltd
UML Diagrams • 12 Diagram Types • Class diagram • Activity diagram • Sequence diagram • State-chart diagram • Use case diagram HL7 UK 2003 (c) Abies Ltd
UML Notation • Classes and Attributes • Association (Composition and Aggregation) • Specialisation • Multiplicities (optionality) HL7 UK 2003 (c) Abies Ltd
Composition HL7 UK 2003 (c) Abies Ltd
Aggregation HL7 UK 2003 (c) Abies Ltd
Specialisation HL7 UK 2003 (c) Abies Ltd
Navigation HL7 UK 2003 (c) Abies Ltd
Healthcare Party HL7 UK 2003 (c) Abies Ltd
Attributes HL7 UK 2003 (c) Abies Ltd
Patients and Healthcare Parties HL7 UK 2003 (c) Abies Ltd
Healthcare Document Structure HL7 UK 2003 (c) Abies Ltd
Clinical Information Complexes HL7 UK 2003 (c) Abies Ltd
Headings and Problem Lists HL7 UK 2003 (c) Abies Ltd
Clinical Statements HL7 UK 2003 (c) Abies Ltd
Clinical Information Items HL7 UK 2003 (c) Abies Ltd
Conclusions • Health Information is complex, but not impossibly complex • This paper has illustrated a few high level patterns • UML and XML provide complementary sets of tools HL7 UK 2003 (c) Abies Ltd