Dear Everyone, just to add another perspective, in the Galen project post coordination was the norm while IHTSDO sits on a heritage of some 300 000 "things" Snomed CT needs to take care of. Also, pre-coordination is (I think) required for making fixed length identifiers. Still, Snomed CT is unusable without post-coordination, making pre-coordinated entities for everything in Snomed CT that has laterality would mean approcimately 700 000 entities.
/Daniel On Thu, 2008-06-05 at 20:19 +1000, Hugh Leslie wrote: > Hi Stef, > > SNOMED can be pre or post co-ordinated. A pre coordinated term is > something like "left foot" where the side is included as part of the > whole code and there is a separate term for "right foot". There are > many such codes in SNOMED. A post coordinated term is one which is > described by a number of codes i.e. "foot", "left". This can get as > complex as you like such as this example from wikipedia > 284196006|Burn of skin|: > 246112005|Severity|=24484000|severe, > 363698007|Finding Site|= > (113185004|Structure of skin between fourth and fifth > toes|:272741003|Laterality|=7771000|left) > We believe that building and querying for these complex post > coordinated sentences is very difficult. The marriage of archetypes > and terminology is a good one as much of the complexity of trying to > express these things in a terminology can be expressed more simply > using an archetype with the terminology enabling inferencing. > > hope this helps > > regards Hugh > > Stef Verlinden wrote: > > Hi Ian and Gerard, > > > > > > Could you please explain what post-coordination is and maybe provide > > an example of post- (and pre-?) coordination? > > > > > > Cheers, > > > > > > Stef > > > > Op 5-jun-2008, om 0:48 heeft Ian McNicoll het volgende geschreven: > > > > > "most > > > post-coordination (using modifiers in Snomed-space instead of > > > Archetype/Template space) must end", > > > > > > > > ____________________________________________________________________ > > > > _______________________________________________ > > openEHR-technical mailing list > > openEHR-technical at openehr.org > > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > > > > -- > ________________________________________________ > Dr Hugh Leslie MBBS, Dip. Obs. RACOG, FRACGP, FACHI > Clinical Director > Ocean Informatics Pty Ltd > M: +61 404 033 767 E: hugh.leslie at oceaninformatics.com W: > www.oceaninformatics.com > > > _______________________________________________ > openEHR-technical mailing list > openEHR-technical at openehr.org > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical
