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Re: Multi-purpose / Single source

Subject: Re: Multi-purpose / Single source
From: Peter Neilson <neilson -at- alltel -dot- net>
To: "TECHWR-L" <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Wed, 05 Jan 2005 03:14:52 -0500


On Wed, 5 Jan 2005 08:36:07 +0100, Broberg, Mats <Mats -dot- Brobergold -at- flir -dot- se> wrote:

Since Java is used to resolve the conditions, Java syntax can be used
for complex Boolean conditions can be used. In one manual, a dimensional
drawing showing a small video lamp is surrounded by the following
condition:

(HAS.HANDLE.AND.RC || !HAS.HANDLE.AND.RC) && HAS.VIDEO.LAMP

which would mean that cameras which HAVE OR HAVE NOT a handle and remote
control, AND HAS the possibility to connect a video lamp will have this
dimensional drawing included.

Ummm, this logic is slightly broken, isn't it? The expression
(HAS.HANDLE.AND.RC || !HAS.HANDLE.AND.RC)
appears to be a tautology, true regardless of the value of
HAS.HANDLE.AND.RC, so the entire condition could be replaced by
HAS.VIDEO.LAMP

Is there some situation I'm not seeing, in which
(HAS.HANDLE.AND.RC || !HAS.HANDLE.AND.RC) could be false?

Some other example would better show the power of using moderately
complex Boolean conditions.


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References:
RE: Multi-purpose / Single source: From: Broberg, Mats

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