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- outside a predicate
No Format o/data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/value>$systolicCriteria
When parameters are neededParameters are needed when the same AQL query statement is used with different criteria values. This AQL example is to return all abnormal blood pressure values for a single specific EHR. This query has a parameter $ehrUid. This parameter will be substituted by a real EHR.ehr_id value at run time. Consequently, this query can be reused for all EHRs either within an EHR system or by other EHR systems (Assuming these EHR systems support AQL).
Predicates
AQL has three types of predicates: standard predicate, archetype predicate, and node predicate.
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