Supporting Informative comments within AQL predicates - using a pair of "|" characters.

Similar to IHTSDO pipe syntax used for term description, it would be convenient to support arbitrary comments inside AQL predicates.
Content enclosed by a pair of "|" characters is completely ignored by EHRSrv.

Example;

SELECT bp
FROM EHR e
CONTAINS OBSERVATION bp[openEHR-EHR-OBSERVATION.blood_pressure.v1]
WHERE bp/data[at0001]/events[at0006]/data[at0003]/items[at0004|Systolic|]/value/magnitude>110