Re: ANN: a portable data component -- length
On Sat, 2011-04-09 at 11:10 -0400, Costello, Roger L. wrote: > Here is the altitude of an aircraft, expressed in both feet and meters: > > <altitude> > <feet>12000</feet> > <meters>3657.6</meters> > </altitude> > > It is important that the two length values are consistent: The right way to mark this up in most cases is to store only one value and convert as needed. See Normal Form in database theory: information should never be duplicated. That way it can't get out of sync. So my answer is simply, "don't do this." Instead, e.g. <measurement> <name>altitude</name> <value units="m">3657.6</value> </measurement> (I'd use metric/SI units in a program as they're easier to deal with, and mixed-based ambiguity like 3 feet 7 inches doesn't occur) Best, Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://www.fromoldbooks.org/ Occasional blog: http://www.barefootliam.org/ The barefoot typographer
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