Add property for <Units of Measure>

[ChLaaboudi]

The Combined Nomenclature and PRODCOM List provide a 'volume physical unit’ (unit of measure) quantifying the units being classified.
We manage these Units in a distinct code list that we reference in the classifications in the property <stat:statUnitMeasure> (STAT-DCAT) as there is no property currently available in XKOS. We think it would be relevant to introduce such a property in XKOS.

Reference: Best Practice Guidelines For Developing International Statistical Classification
Units of measure are often associated with statistical classifications used for the production of trade and/or commodity data. Units of measure are a way of quantifying the units being classified, and are part of the basic category definition. The units usually correspond to international standard codes and definitions for weights and measure based on ISO 1000 or the International System of Units (SI). The units may be associated with the classification units or the data produced from the classification.

[tfrancart]

Hello @ChLaaboudi

Thank you. This is a subject for XKOS V2.
The corresponding best practices would need to be included in the best practices document.