Duplicated Dimensions

[jmkeil]

There are 5 cases of a pair of om:Dimension instances with the same dimension exponent vector:

Dimension 1	Dimension 2
om:illuminance-Dimension	om:luminance-Dimension
om:energyDensity-Dimension	om:pressure-Dimension
om:luminousFlux-Dimension	om:luminousIntensity-Dimension
om:angularSpeed-Dimension	om:frequency-Dimension
om:powerDensity-Dimension	om:radiance-Dimension

They are named to fit for different quantities. However, to my understanding, dimensions are quantity agnostic. So they better should have multiple labels expressing the relatedness to different quantities, but the dimension vector should be unique.

As a first fix, I suggest to link them with owl:sameAs.

Query to find them:

PREFIX om: <http://www.ontology-of-units-of-measure.org/resource/om-2/>

SELECT ?dimension1 ?dimension2 WHERE {
  ?dimension1
    om:hasSIAmountOfSubstanceDimensionExponent ?AmountOfSubstance ;
    om:hasSIThermodynamicTemperatureDimensionExponent ?ThermodynamicTemperature ;
    om:hasSIElectricCurrentDimensionExponent ?ElectricCurrent ;
    om:hasSILuminousIntensityDimensionExponent ?LuminousIntensity ;
    om:hasSILengthDimensionExponent ?Length ;
    om:hasSIMassDimensionExponent ?Mass ;
    om:hasSITimeDimensionExponent ?Time .
  ?dimension2
    om:hasSIAmountOfSubstanceDimensionExponent ?AmountOfSubstance ;
    om:hasSIThermodynamicTemperatureDimensionExponent ?ThermodynamicTemperature ;
    om:hasSIElectricCurrentDimensionExponent ?ElectricCurrent ;
    om:hasSILuminousIntensityDimensionExponent ?LuminousIntensity ;
    om:hasSILengthDimensionExponent ?Length ;
    om:hasSIMassDimensionExponent ?Mass ;
    om:hasSITimeDimensionExponent ?Time .
  FILTER(STR(?dimension1) < STR(?dimension2))
}

PS: For OM3 I suppose to use the vector in the IRI. That would make it lot easier to find appropriated dimension and avoid duplicates.