AQL

SELECT e/ehr_id/value, c/context/start_time/value as startTime, obs/data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/magnitude AS systolic, c/uid/value AS cid, c/name FROM EHR e CONTAINS COMPOSITION c[openEHR-EHR-COMPOSITION.encounter.v1] CONTAINS OBSERVATION obs[openEHR-EHR-OBSERVATION.blood_pressure.v1] WHERE obs/data[at0001]/events[at0006]/data[at0003]/items[at0004]/value/magnitude >= $systolic_bp