@bna- agree the challenge here is figuring out a basic set of rules that can be safely applied, particularly where parts of the datatype are ‘indivisible’ e.g magnitude+units or defining_code + terminology_id.
Answers
1a. Yes but not in this tranche of AQL
2. Yes- let’s make a start on DV_TEXT/CODED_TEXT - I think there are close connections with use of ‘stringified’ elements in GDL/Flat formats and ExpLang.
I think there is considerable value in this well beyond sort/compare in AQL.