CTS handling of units of measure

[Steve Ray <steveraysteveray@gmail.com>]

The identification of units of measure described on lines 344 and 347 seems prone to error, since there is no specification for how a unit is identified. One party might transmit kW while another uses kiloWatt, and a third uses kiloW.

I suggest one of the following remedies,Âin order of increasing commitment:

1. (Easiest). Point to a persistent URI that uniquelyÂidentifies the desired unit, as documented at http://qudt.org. For example,Âhttp://qudt.org/vocab/unit/KiloW uniquely identifies a kiloWatt. This can be prefixed as unit:KiloW using the unit: prefix as registered at prefix.cc

2. Model the key concepts found at http://qudt.org within the CTS standard, populated with just the necessary units for electricity transactions. These concepts include Quantity Kind (such as Power) and Unit (such as Watt). This would improve the likelihood of interoperability with future standards.

3. Adopt the http://qudt.org specification (managed atÂhttps://github.com/qudt/qudt-public-repo). While not yet a standard, QUDT is likely to bear a strong resemblance to the future Digital SI specification being developed under the auspices of the BIPM.

Steve