Hello,
Using terminology bindings it is posssible to bind terminology IDs of specific terminologies to archetypes as well as to their members. In the openEHR documentation it is written that there is no concept of post-coordination outside the terminology environment. What does that exactly mean ? When I have a post-coordinated expression, how do I use it within openEHR ? The linkage of an openEHR system to a potential terminology server is something that I do not yet unterstand very well.
Greetings
Georg
IMO it means post coordinated stuff can’t be used at design time in archetypes. It can be used at runtime. For instance we use snomed expressions embedded in openEHR queries to filter coded texts. In the archetype or template that defines that coded text, there is only a binding with snomed, nothing else.
Pablo,
I agree that there are special rules on how to use coding systems.
Only in specified domains at specified levels in ontology the pre- or postco-orinated codes can be used safely.
Without rules there will be overlap of ways to code in the archetype versus coding in the coding system.
This is the Boundary Problem.
It can be avoided by rules:
- refrain from using co-ordinated codes, except for anatomical structures
- create archetypes that allow to express all the pre/post-co-oriated codes
- all nodes in the archetype need to be coded using Reference Coding Systems (SNOMED, LOINC)
In my view the Archetype is the preferred way to express pre-/post coordinated terms.
Gerard Freriks
+31 620347088
gfrer@luna.nl
Kattensingel 20
2801 CA Gouda
the Netherlands