Re: sh:minInclusive and custom datatypes

>  being able to compare feet to inches to millimeters and so on

There is such a thing:

   - https://ci.mines-stetienne.fr/lindt/index.html
   - https://ci.mines-stetienne.fr/lindt/playground.html
   - https://ci.mines-stetienne.fr/lindt/v2/custom_datatypes.html,
   https://ci.mines-stetienne.fr/lindt/spec.html
   - https://github.com/thesmartenergy/jena,
   https://github.com/OpenSensingCity/jena-ucum

It's based on the Java UCUM library.
It puts number and unit in the same string eg "1 m"^^cdt:ucum, "100
cm"^^cdt:ucum.
This is very economical, but more importantly you can compare such
quantities, and you can also do arithmetic operations on quantities.
Maxime tells me it even supports complex numbers, which are important in
some electricity applications, is that correct? Can you give an example?

LINDT is very ingenious and it's a pity that it hasn't found a wider
following.

   - It's implemented as a Jena branch but hasn't been merged into trunk:
   "This branch is 14 commits ahead, 5325 commits behind apache:master."
   - We have been looking for a pretext (i.e. client) to implement it in
   rdf4j.

I think it would be great if the Sensor, Smarti City and WoT communities
adopt this approach.
I'll post it on the SPARQL 1.2 github.