Hi Thomas / Diego, As far as the published archetypes are concerned we will have thought fairly carefully about if and when to constrain EVENT to Point or Interval, and this is definitely something that should be applied at template level in most cases but, as ever, we have to be careful not to over-apply constraints when the downstream use cases are not wholly clear.
Ian On 21 June 2012 09:21, Thomas Beale <thomas.beale at oceaninformatics.com> wrote: > On 20/06/2012 20:30, Diego Bosc? wrote: > > So you have to select the ITEM_STRUCTURE class but you don't have to > select the EVENT class? (most CKM archetypes have now EVENT and not > INTERVAL_EVENT or POINT_EVENT) > I think it should be allowed/forbidden following only one criteria. > > > > in general, there is no harm not choosing a subtype if you are only > constraining properties of the supertype. In the case of ITEM_STRUCTURE this > doesn't make sense because it is an abstract type with no structure defined; > anything you want to constrain will be in a particular subtype. > > In the case of EVENT however, you can sensibly constrain just EVENT > properties, and if you don't force the subtype, you are saying - I don't > care if this event happens to be a point event or an interval event, which > is entirely reasonable. Although, I must admit I suspect that at least some > of those CKM archetypes probably did really intend only a POINT_EVENT, so in > some cases, the type constraint should be made. > > - thomas > > _______________________________________________ > openEHR-technical mailing list > openEHR-technical at lists.openehr.org > http://lists.openehr.org/mailman/listinfo/openehr-technical_lists.openehr.org -- Dr Ian McNicoll office +44 (0)1536 414 994 fax +44 (0)1536 516317 mobile +44 (0)775 209 7859 skype ianmcnicoll ian.mcnicoll at oceaninformatics.com Clinical Modelling Consultant,?Ocean Informatics, UK Director openEHR Foundation ?www.openehr.org/knowledge Honorary Senior Research Associate, CHIME, UCL SCIMP Working Group, NHS Scotland BCS Primary Health Care ?www.phcsg.org
