I opt for adding an additional (optional) element to the dimensionality array that describes the unit of measure for a parameter.
The current order stands as:
m, kg, S, A, K, mole, cd, rad
I would opt for
m, kg, S, A, K, mole, cd, rad, delta
where delta is a flag that is zero by default. The flag being non-zero (unity?) means that the unit of measure that is described is a relative one, e.g. a gauge pressure or a delta-temperature. For unit of measure conversions involving such dimensionalities, an offset should not be taken into account. So where the conversion between K and C is [K]=1.0*[C]+273.15, for a delta-temperature the conversion would be [K]=1.0*[C]
This has been discussed in the unit SIG as such before, and will be implemented in COCO 1.13
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jasper SIG participant 
Joined: 19 Sep 2008 Posts: 294 Location: Spain 
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  Dimensionality |
| Sun Oct 19, 2008 9:09 pm |     |
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