Hi Thomas,
It depends on what you mean with "specialise". I do not wish to create a
new archetype but I rather would like to query existing instances of the
openEHR-EHR-CLUSTER.laboratory_test_analyte.v1 archetype. From those
instances I would like to query only this with specific attributes. One
constraint I am able to define is to constrain the analyte name:
SELECT e
FROM EHR e CONTAINS CLUSTER
a[openEHR-EHR-CLUSTER.laboratory_test_analyte.v1]
WHERE a/items[at0024]/value/value = 'Calcium'
But how can I manage to as well constrain the value ? The path
openEHR-EHR-CLUSTER.laboratory_test_analyte.v1/items[at0001] is of the
type ELEMENT, which has a DATA_VALUE for its field "value". The concrete
instances of the analytes do have decendents of the DATA_VALUE type in
the place for ELEMENT[at0001]/value, e.g. DV_QUANTITY. Is it possible to
use paths to those concrete value types in the WHERE-paths, such like:
SELECT e
FROM EHR e CONTAINS CLUSTER
a[openEHR-EHR-CLUSTER.laboratory_test_analyte.v1]
WHERE a/items[at0024]/value/value = 'Calcium' AND
a/items[at0001]/value/magnitude > 100
From a type checking point of view, this is not allowed, because the
data type at the path a/items[at0001]/value (which is DATA_VALUE) does
not contain a field "magnitude". To make this work I would have to bind
the value to the concrete type, with something like:
SELECT e
FROM EHR e CONTAINS CLUSTER
a[openEHR-EHR-CLUSTER.laboratory_test_analyte.v1]
CONTAINS DV_QUANTITY b
WHERE a/items[at0024]/value/value = 'Calcium' AND a/items[at0001]/value
= b and b/magnitude > 100
but I don't think this is allowed in AQL. I am not yet that fluent in
AQL, so I could need a little help in this.
Greetings
Georg
--
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Dipl.-Inf. Georg Fette Raum: B001
Universität Würzburg Tel.: +49-(0)931-31-85516
Am Hubland Fax.: +49-(0)931-31-86732
97074 Würzburg mail: georg.fe...@uni-wuerzburg.de
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