Units: How to deal with units not defined in QUDT?

[fosterlynn]

QUDT, which we decided to use early on for our quantities, is a very complete set of units of measure, with conversion capabilities, for the scientific community. They even have complex units, like GallonUSPerDay. Here is our initial definition: https://github.com/valueflows/valueflows/pull/5/files

QUDT also is adding other kinds of units, like Currency, but as far as I can tell, this is not ready yet. And it will never have Faircoin. :)

Here also is an older issue #152 with suggestion for units of time.

But.... Here is a group extending QUDT: http://www.openphacts.org/specs/2013/WD-units-20130913/.

And here is a discussion in schema.org about how to map to qudt - they have a lot of units defined also. schemaorg/schemaorg#1390

So, this issue is to nail down how we will define quantities and units, since it affects our core entities. Should we:

• Show how to define new units in QUDT, even define some we know are needed? And define our vf:quantity to only be defined in QUDT?
• Allow a vf:quantity property to reference different vocabulary definitions of instances of units?

[elf-pavlik]

I think we need https://en.wikipedia.org/wiki/Dimensionless_quantity

http://qudt.org/doc/2017/DOC_VOCAB-UNITS-BASE.html

has unit:NUM and unit:UNITLESS

[almereyda]

We have moved the ValueFlows organization from GitHub to https://lab.allmende.io/valueflows.

This issue has been closed here, and all further discussion on this issue can be done at

https://lab.allmende.io/valueflows/valueflows/-/issues/215.

If you have not done so, you are very welcome to register at https://lab.allmende.io and join the ValueFlows organization there.