Gerard Freriks wrote: > > > Certain archetype fragments will be needed. They are the prototypic > ones. The ones I'm calling 'ancestor archetypes' are the standardised > starting points we use to derive archetypes of. > They act as the start of families of archetypes. > The ones dealing with observations, the ones expressing measurements, etc. > > ah, well, you know my view on that! I beieve that basic categories such as Observation, Evaluation, Instruction and Act belong in the reference model, for two reasons: a) it proves possible to devise formal models of such concepts which work for all possible specific types of the same concept. This is proven by building archeytpes. For example, no matter what kind of clinical observation we model with an archetype, the openEHR Observation concept still works. In some recent cases described by Grahame Grieve and Sam Heard, there may be a small change needed. This is how these classes can be evolved into solid, invariant definitions which work for all clinical uses.
b) we want to avoid the situation where archetype developers, or even develpers of 'proto-archetypes' are arguing about what an Observation, Evaluation etc are, and producing competing ancestor archetypes of differing versions of the concept. This will not help interoperability, and in any case, isn't even an interesting topic for most clinical people. They want to model concepts like "Haemaglobin A1c measurement", not "Observation". There is already a place for those that do want to debate what an Observation is: the reference model - they can always review that, and propose changes. Sam and I have a paper under development which provides what we think is a solid theoretical and practical basis for basic types in the reference model, and provides a comprehensive typology of Entry subtypes. I think this will make the matter of what 'proto-archetypes' should and should not be used for clearer. - thomas -- ___________________________________________________________________________________ CTO Ocean Informatics (http://www.OceanInformatics.biz) Research Fellow, University College London (http://www.chime.ucl.ac.uk) Chair Architectural Review Board, openEHR (http://www.openEHR.org) - If you have any questions about using this list, please send a message to d.lloyd at openehr.org
