Now that I have more experience with SNOMED expressions, I like the idea of
doing the binding with an expression, also I think an expression includes
the single code binding, if that is correct there is no need of defining a
different notation for single code binding, just use a simple expression
formed by one specific concept code. Also the expression being something
processable and very versatile, we can express complex concepts with a few
codes, which will help on adding knowledge to the archetype and serve to a
better and simpler CDS.

About the metadata, there should be expressed against which SNOMED release
this expression was created. We can't be sure only with min version. I
should be responsibility of the user to check if the expression works on a
different version/release of SNOMED. Another metadata is if the version is
a local extension, some countries have their own extensions.

I don't know if we need to support other terminologies (technically) and if
doing that is useful (strategically). Terminology services can do SNOMED to
ICD, and ICD is not clinical relevant. LOINC is useful, but there is a
SNOMED-LOINC collaboration, so we might expect an official mapping in the
future (https://loinc.org/collaboration/snomed-international/). IMO we
should focus on SNOMED.

On Mon, Jul 17, 2017 at 11:19 AM, Thomas Beale <thomas.be...@openehr.org>
wrote:

> 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
> <https://intermountainhealthcare.org/>
> Management Board, Specifications Program Lead, openEHR Foundation
> <http://www.openehr.org>
> Chartered IT Professional Fellow, BCS, British Computer Society
> <http://www.bcs.org/category/6044>
> Health IT blog <http://wolandscat.net/> | Culture blog
> <http://wolandsothercat.net/>
>
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> openEHR-clinical@lists.openehr.org
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>



-- 
Ing. Pablo Pazos Gutiérrez
pablo.pa...@cabolabs.com
+598 99 043 145
skype: cabolabs
<http://cabolabs.com/>
http://www.cabolabs.com
https://cloudehrserver.com
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