consider making Units instances, not classes

[mobb]

from discussion at AHM:

Usage: in ECSO, e.g., in odo:Heterotrophic_Respiration_Carbon_Flux_MOV, instead of asserting measuresUsing Standard only kilogramPerMeterSquaredPerSec

Say this: measuresUsing value kilogramPerMeterSquaredPerSec Because the MT already has oboe-core:measuresUsingStandard only 'odo:flux unit' The unit kilogramPerMeterSquaredPerSec is an instance of the class ‘odo:flux unit’

For reference, there may be some useful patterns in the MUO ontology (below) however, this is not an active project. http://idi.fundacionctic.org/muo/muo-vocab.html#sec-glance