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Kay Michael wrote: > > 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?] Actually km _is_ an SI unit (multipliers are part of the SI). I also believe hr is (though I can't claim this with the same degree of certainty). It is also permissible to use the division symbol '/', so: km/hr is perfectly reasonable. kph, on the other hand, most certainly isn't SI. Furthermore, ms<sup>-1</sup> represents the unit 'milliseconds to the minus -1', hence the SI requirement to insert either spaces between unit components or, preferably, a dot: m.s<sup>-1</sup> As for their use in attributes, I seem to remember reading that the power notation is never required. It only keeps things tidy. It really depends on whether you are concerned to represent the format or the semantics, though if formatting is the goal then I'd say it doesn't really belong in an attribute anyway. Cheers, Marcelo xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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