Supporting Informative comments within AQL predicates - using a pair of "|" characters.
Description
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
Environment
Activity
If we going to support this inside AQL than we actually need to support it first on the level of archetype path syntax: https://specifications.openehr.org/releases/BASE/latest/architecture_overview.html#_predicate_expressions.
The impact would be higher than only changing AQL.
Is this still needed?
agree, could be useful, but maybe is overlapping with simplified json paths?
We already do support this kind of syntax e.g local::at0004::systolic in some tools e.f for setting default values, so it is not a completely novel idea.
I think it would be helpful to add it to the formal syntax. There is some cross-over in purpose with the simplified json paths but they are slightly different in purpose and need ot tech support. This variant is just for human-readability and basically the parser can ignore anything between ||. With the flat Json paths, (which might be nice to have in AQL) there is a dependency on resolving the actual path by interrogating the source template, and applying the correct mapping plus the constraint would actually be enforced to something like [at0004,'Sys. Reading'] .
Value in both IMO
