Blunders Was: LRUD: 'From' or 'To' ?

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From: Michael Lake (mikel_at_speleonics.com.au)
Date: Wed Jan 24 2001 - 11:12:04 CET 

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Date: Wed, 24 Jan 2001 21:12:04 +1100
From: Michael Lake <mikel_at_speleonics.com.au>
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Subject: Blunders Was: LRUD: 'From' or 'To' ?
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Richard Knapp wrote:
> Interesting point: should the storage format account for blunders? Seems to me if the data is
> invalid, it shouldn't be allowed into the format (which is enforcing valid data). But that is my
> (probably) naive opinion. <g>

I think the XML should barf-on-blunders. Eg Blunder Martin Laverty's Schema has:
<attribute name="bear" type="double" use="required" minInclusive="0"
             maxInclusive="360" />

This enforces that the value must be within a valid range and it is required.

PS. Note that angles can be expressed as an azimuth, a bearing or less commonly as
mils or grads. Azimuthal readings go from 0 to 360 degrees whereas
bearings only range from 0 to 90 degrees because they are the angle around
a quadrant of the full circle. An example would be South 30 degrees East,
written S-45E.
Thats why in my DTD I used AZIM instead of BEAR.

Mike 

-- 
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Michael Lake
Active caver, Linux enthusiast and interested in anything technical.
Safety Convenor, Australian Speleological Federation
Owner, Speleonics (Australia)
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