Units of measurement?

[Kay Michael]

> my approach is to have an attribute for the value in a fixed 
> SI unit...  So for speed it would be something like 
> 
> He was travelling at <Velocity value="1">3600 kph</Velocity>
> 
Surely the SI unit of velocity is metres per second? And the correct
abbreviation is ms<sup>-1</sup>? [how do you put that in an attribute?]

Mike Kay

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