On 08-Mar-10 11:25, Thomas Beale wrote:
>
> A new draft is now up of the AOM 1.5 at
> http://www.openehr.org/svn/specification/TRUNK/publishing/architecture/am/adl1.5.pdf
> . This draft adds in group construct, providing the same capability as
> XML schema choice/sequence/group for ordering elements within container
> attributes. The AOM constraint model with this added in looks as
> follows:
> http://www.openehr.org/wiki/download/attachments/196633/AOM_with_group.png
Hi Thomas,
Thanks for the new draft: adl_1.5.
I imagine that openEHR is the art-of-the-possible so I really value your
latest updates:
In Section 6 - Assertions I note the the advent (in standard cADL
syntax) of Rules involving QUERY RESULTS from a data or knowledge context
- for example (from Section 6.5.5):
$has_diabetes:Boolean ::= query("ehr", "has_diagnosis", "snomed_ct:1234567")
$is_female:Boolean ::= query("ehr", "is_female")
Does this kind of rule provide some sort of basis for implementing
generalized methods (I'm thinking of OOD association relationships)
at the archetype level?
Archetyped objects - with their hermetically sealed inner states -
probably need to share some state info in order to do useful EHR-related
work. And the way in which that state needs to be shared may reflect
semantic order of the modeled EHR beyond that established by the
containment/inheritance constraints envisaged by openEHR at the RM and
CKM level.
Are we sure that this "semantic order" is best left to a set of external
queries and, or, relegated to details of local template modeling?
My pet ruse with openEHR has been that when we get down to the
perspective of the data entry GUI - the validity of the data-input may
depend on knowledge hermetically hidden way in another archetyped object
- and I'd like a principled way of generalizing the validation rule (for
reuse) - who knows: it might even be important semantic element of the
pattern of system of archetypes.
And informal semi-structured querying such as query("ehr", "is_female")
still seems a bit of an abdication of responsibility to me.
Gavin Brelstaff
CRS4 Sardinia Italy.
