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   Re: [xml-dev] ANN: XML Schema of measurement units

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  • To: "Roger L. Costello" <costello@mitre.org>, xml-dev@lists.xml.org
  • Subject: Re: [xml-dev] ANN: XML Schema of measurement units
  • From: Elliotte Rusty Harold <elharo@metalab.unc.edu>
  • Date: Mon, 16 Dec 2002 10:04:45 -0500
  • Cc: "Costello,Roger L." <costello@mitre.org>
  • In-reply-to: <3D63EEB4.D2A2D64F@mitre.org>
  • References: <2C61CCE8A870D211A523080009B94E430752B853@HQ5><3D63EEB4.D2A2D64F@mitre.org>

At 3:49 PM -0400 8/21/02, Roger L. Costello wrote:
>Hi Folks,
>I have created an XML Schema[1] containing simpleType definitions that
>enumerate the units for:
>    - temperature
>    - length
>    - weight
>    - volume
>    - area
>    - cooking
>    - speed

I think this confuses the units for mass and weight. For example, if 
I recall my high school physics correctly, kilogram is a unit of mass 
while pound is a unit of weight. If you fly to the moon your mass in 
kilograms stays the same but your weight decreases. In the metric 
system I think weight would be measured in dynes or newtons while in 
the English system mass would be measured in slugs.

Of course in day-to-day usage among non-scientists on planet Earth, 
weight and mass are used interchangeably. Thus I wonder whether it's 
even possible to come up with a canonical list of all possible units, 
when not everyone agrees all the time what the untis are measuring.

| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
|          XML in a  Nutshell, 2nd Edition (O'Reilly, 2002)          |
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