Hi Georg,
ITEM is an abstract type. The hierarchy pattern of ITEM / CLUSTER /
ELEMENT
<https://specifications.openehr.org/releases/UML/latest/#Diagrams___18_1_83e026d_1433773264427_531476_6966>
is one of the most common in class modelling.
- thomas
On 30/10/2019 09:26, Georg Fette wrote:
Hello,
I would like to typecheck AQL queries and have some problems doing that:
The items in a CLUSTER are of type ITEM. If I access
myCluster/items[at0001]/value, is there any possibility to type-check
the validity of this path without having the concrete archetype
definition at hand? Just using the reference model isn't enough for
this task, because ITEMs do not have a value-field.
How can (from an object oriented point of view) the values of the
ITEMs be accessed without knowing if it is an ELEMENT ?
Why is there a distiguishment between ELEMENT, ITEM and CLUSTER at all
? If the fields "items" and "value" were already attached to the class
ITEM it would be easier.
Greetings
Georg
--
Thomas Beale
Principal, Ars Semantica <http://www.arssemantica.com>
Consultant, ABD Project, Intermountain Healthcare
<https://intermountainhealthcare.org/>
Management Board, Specifications Program Lead, openEHR Foundation
<http://www.openehr.org>
Health IT blog <http://wolandscat.net/> | Culture blog
<http://wolandsothercat.net/> | The Objective Stance
<https://theobjectivestance.net/>
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