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Re: ANN: a portable data component -- length

  • From: Liam R E Quin <liam@w3.org>
  • To: "Costello, Roger L." <costello@mitre.org>
  • Date: Sat, 09 Apr 2011 12:00:20 -0400

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.
    <value units="m">3657.6</value>

(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)



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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