How to handle measurement transformations

[DiegoVinasco]

Measurements in GML are a datatype+attribute composed of a value and a unit of measure (uom)

Shapechange proposes transforming these to the <http://shapechange.net/resources/ont/base#Measure> datatype which is a string containing both the value and the uom separated by a space. Although this solves the problem (a simpletype+attribute is transformed into a owl datatype), semantic data is lost when the decimal is transformed into a string.

Alternative:
Transform GML measure to the http://def.isotc211.org/iso19103/2005/UnitsOfMeasure#Measure or the http://def.isotc211.org/iso19103/2015/MeasureTypes#Measure class which can have value and uom datatype properties

[DiegoVinasco]

these classes can be treated as an exception and the XML-to-OWL transformer can take them into account during #28