Hi,
FYI: I'd just like to point you to following two forthcoming standard
parts from "ISO/IEC JTS 1/SC 32" comittee: one on JSON, and one on
"Multi-Dimensional Arrays" (SQL/MDA).
They define there some things different as already in PG. See also
Peter Baumann's slides [1] and e.g. [2]
:Stefan
[1] https://www.unibw.de/inf4/professors/geoinformatics/agile-2016-workshop-gis-with-nosql
[2] http://jtc1sc32.org/doc/N2501-2550/32N2528-WG3-Tutorial-Opening-Plenary.pdf