Pete Horsfield wrote:
>Matius > >It is probably worth you investigating the UK GP2GP records transfer project >which is using an HL7 based XML schema to underpin records exchange between GP >systems in the UK: > >http://www.nhsia.nhs.uk/gp2gp/pages/default.asp > >The GP2GP schema is not, strictly speaking, an open EHR schema but must be >highly relevant. > It is as an idea, but it has mixed up the notion of the HL7 RIM ( a model of acts) with the CEN model of documentation, which is very similar to the CDA and the openEHR concepts. The requirement for GP2GP was to get information from one GP system to another, where there are about 3 kinds of system to my knowledge, and the information is based on CEN 13606. The appropriate way to do this would have been simply to use the CEN EHR_EXTRACT (or use newer versions of this concept from the CEN 13606 revision proposals or openEHR), or even to use HL7 CDA. However, recoding CEN EHR data as an HL7 message does not make any sense, and I wonder about data safety, given the contortions one has to go through to turn what is a simple model of Extract, Folder, Composition etc into a bunch of Acts containing moods, activity times and suchlike which have no meaning for these components in general. The CEN model is already a formal model, and the attempt to recode it in terms of another model is contrary to normal modelling practices. We have made a lot of efforts to perform a proper analysis of these issues, which show where context attributes should go, which are documented in the CEN 13606 revision, and at more length in the "Design Principles" paper on the openEHR website. The correct relationship between the HL7 model and a "model of recording: such as CEN, CDA or openEHR is that Acts and Act relationships map to Entrys and links - i.e. the HL7 concepts document something in the real world, and this becomes the "content" of a document - which is done at the Entry level. regards, - thomas beale - If you have any questions about using this list, please send a message to d.lloyd at openehr.org
