Terminology bindings ... again

Thomas Beale thomas.beale at openehr.org
Mon Jul 17 10:19:29 EDT 2017

Recently we discussed terminology bindings. We probably still have not 
got them right, but we don't have a model of what we think they should 
be. I posted a quick idea of a possible more structured version:

|term_bindings = < ["snomed_ct"] = < 
["/data[id3]/events[id4]/data[id2]/items[id26]"] = (SIMPLE_BINDING) < 
target = <http://snomedct.info/id/169895004> -- Apgar score at 1 minute 
notes = <"some notes"> min_version = <"2017-02-01"> etc = <"etc"> > 
["id26"]|||= (CONSTRAINT_BINDING) <| |||target |= <||"71388002|Procedure|:405815000|Procedure device| = 122456005|Laser 
device|, 260686004|Method| = 129304002|Excision - 
action|,405813007|Procedure site - direct| = 1549700l6|Ovarian structure|">||||||||min_version = <"2017-04-01">| notes = <"some notes"> etc = <"etc"> |> > >|

I noted that the right hand side of a binding can be a few different 
things, each of which would be accompanied by various meta-data, including:

  * a single concept code
  * a single code or other id referring to an external value set in an
    external terminology (in SNOMED it is a SNOMED code; for e.g. ICD10,
    there is no standard that I know of)
  * a composition expression that refers to a more refined concept
  * possible a constraint expression that locally determines a value set
    intensionally, to be resolved by application to the Terminology service.

I'd rather avoid the last, because of the brittleness of intensional 
ref-set query syntax expressions. In any case, we need a better idea of 
what meta-data are needed. E.g.:

  * something to do with (min) version of terminology required for the
    reference to be valid
  * something to do with purpose?
  * other notes - a tagged list of basic types?

I would like to get a better idea of the requirements.

- thomas

Thomas Beale
Principal, Ars Semantica <http://www.arssemantica.com>
Consultant, ABD Team, Intermountain Healthcare 
Management Board, Specifications Program Lead, openEHR Foundation 
Chartered IT Professional Fellow, BCS, British Computer Society 
Health IT blog <http://wolandscat.net/> | Culture blog 
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