I randomly noticed that there is a list of dimensions in thing-description-1.0.0.xsd:
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<xs:simpleType name="dimension"> |
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<xs:restriction base="xs:string"> |
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<xs:enumeration value="Intensity" /> |
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<xs:enumeration value="Acceleration" /> |
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<xs:enumeration value="AmountOfSubstance" /> |
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<xs:enumeration value="Angle" /> |
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<xs:enumeration value="AngularAcceleration" /> |
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<xs:enumeration value="AngularVelocity" /> |
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<xs:enumeration value="Area" /> |
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<xs:enumeration value="CatalyticActivity" /> |
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<xs:enumeration value="DataAmount" /> |
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<xs:enumeration value="DataRate" /> |
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<xs:enumeration value="Dimensionless" /> |
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<xs:enumeration value="Duration" /> |
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<xs:enumeration value="DynamicViscosity" /> |
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<xs:enumeration value="ElectricCapacitance" /> |
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<xs:enumeration value="ElectricCharge" /> |
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<xs:enumeration value="ElectricConductance" /> |
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<xs:enumeration value="ElectricCurrent" /> |
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<xs:enumeration value="ElectricInductance" /> |
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<xs:enumeration value="ElectricPotential" /> |
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<xs:enumeration value="ElectricResistance" /> |
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<xs:enumeration value="Energy" /> |
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<xs:enumeration value="Force" /> |
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<xs:enumeration value="Frequency" /> |
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<xs:enumeration value="Illuminance" /> |
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<xs:enumeration value="KinematicViscosity" /> |
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<xs:enumeration value="Length" /> |
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<xs:enumeration value="LuminousFlux" /> |
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<xs:enumeration value="LuminousIntensity" /> |
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<xs:enumeration value="MagneticFlux" /> |
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<xs:enumeration value="MagneticFluxDensity" /> |
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<xs:enumeration value="Mass" /> |
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<xs:enumeration value="MassFlowRate" /> |
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<xs:enumeration value="Power" /> |
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<xs:enumeration value="Pressure" /> |
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<xs:enumeration value="RadiationDoseAbsorbed" /> |
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<xs:enumeration value="RadiationDoseEffective" /> |
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<xs:enumeration value="RadioactiveActivity" /> |
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<xs:enumeration value="SolidAngle" /> |
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<xs:enumeration value="Speed" /> |
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<xs:enumeration value="Temperature" /> |
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<xs:enumeration value="Torque" /> |
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<xs:enumeration value="Velocity" /> |
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<xs:enumeration value="Time" /> |
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<xs:enumeration value="Volume" /> |
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<xs:enumeration value="VolumetricDensity" /> |
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<xs:enumeration value="VolumetricFlowRate" /> |
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</xs:restriction> |
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</xs:simpleType> |
This list hasn't been updated for a while, for example the following are missing:
- DataAmount introduced in #681
- EmissionIntensity introduced in #4069
- EnergyPrice introduced in #3503
- RadiationSpecificActivity introduced in #3608
and probably others as well.
But then I validated a thing type definition containing one of those, and it passed. Apparently dimension is not used at all, since item-type is defined as xs:string:
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<xs:element name="item-type" type="xs:string" minOccurs="0"/> |
So I'm wondering: Should it even be in the file? Is it a left-over, or deliberately kept for some sort of legacy backwards compatibility?
Expected Behavior
I would expect dimension to be either maintained and used, or not in the XSD at all.
Current Behavior
The XSD contains a definition for dimension, but apparently it is not used.
Possible Solution
Remove it from the XSD, if this is feasible without breaking compatibility and/or requiring a new version, which might complicate things.