Hello,
I have some problems concerning the formulation of an AQL query.
I would like to check a laboratory analyte within a laboratory test. The
analyte should have "Calcium" as analyte name and I would like to
receive all EHRs that contain the analyte as the query result.
The SELECT part seems easy, as I just want the EHRs, so this looks like
this:
SELECT e
A problem I now have is about the nesting of the Archetypes. As the test
is an OBSERVATION and an EHR contains only COMPOSITIONs, I wonder if I
have to include a COMPOSITION in order to reach the tests. This would
lead to a FROM part looking like this:
FROM EHR e
CONTAINS COMPOSITION
CONTAINS OBSERVATION
b[openEHR-EHR-OBSERVATION.laboratory_test_result.v1]
The next problem I have is about the definition of the containment of
the analyte in the FROM part or better in the WHERE part. The FROM part
would require me to define the actual nesting structure of the
test-OBSERVATION up to the analyte-CLUSTER. This would look like this:
FROM EHR e
CONTAINS COMPOSITION
CONTAINS OBSERVATION
b[openEHR-EHR-OBSERVATION.laboratory_test_result.v1]
CONTAINS HISTORY
CONTAINS EVENT
CONTAINS ITEM_TREE
CONTAINS CLUSTER
c[openEHR-EHR-CLUSTER.laboratory_test_analyte.v1]
This looks a bit bloated, so I think this should rather be moved to the
WHERE part, which would look like this:
FROM EHR e
CONTAINS COMPOSITION
CONTAINS OBSERVATION
b[openEHR-EHR-OBSERVATION.laboratory_test_result.v1]
WHERE
b/data[at0001]/events[at0002]/data[at0003]/items[at0097]/items[at0024].value
= 'Calcium'
In this WHERE path I am wondering about the necessity of the path part
predicates (i.e. the [at...] parts). Are these predicates always
necessary for every path part ? Or are they only necessary when the path
part object would be ambiguous without the predicate (e.g. in the items
of CLUSTERs or ITEM_LISTs) ?
Furthermore I wonder about the namespace from which the predicates are
taken from. For the first part of the WHERE until the archetype slot is
reached (i.e. b/data[at0001]/events[at0002]/data[at0003]/items[at0097])
the predicates are from the laboratory_test_result archetype. For the
rest of the path (i.e. /items[at0024].value) the predicates are taken
from the laboratory_test_analyte archetype. This switching of namespaces
seems wrong, so I think I still have some misunderstanding of AQL
concerning the predicates.
How would the correct query/queries look like ? Are there multiple valid
alternatives to express my query using combinations of the approaches
scetched above ?
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: [email protected]
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