Understandable Logical Design Specifications for HL7 CDA Interoperability

This paper describes the approach adopted by the Turkish National Health Information System to build a national Data Warehouse, covering more than 50 Data Sets, specified by the Ministry of Health, and an EHR for each citizen. The messages are first specified using a UML logical design model, which is understandable to all stakeholders. These specifications are then mapped to HL7 CDA Release 2 to produce the wire format specifications, xsd's and java classes. Each message is assembled from stand-alone Data Sets, which populate the Data Warehouse, and Sections which are used to create the EHR.