[talk-au] maxheight/height

Liz edodd at billiau.net
Tue Jul 28 01:48:57 BST 2009


On Tue, 28 Jul 2009, Roy Wallace wrote:
> On Tue, Jul 28, 2009 at 10:10 AM, Stephen Hope<slhope at gmail.com> wrote:
> > No, you're wrong here. Maxheight is an element of the way that goes
> > under the bridge.  It is caused by the bridge, but it is not part of
> > the bridge.
>
> You're saying that the clearance under a bridge is not an attribute of
> the bridge? I'm not at all convinced of that. But it is subjective, so
> we may have to agree to disagree.
>
> > It is the road under the bridge that has the limitation,
> > not the bridge. Divided roads often have different max heights on each
> > side, but it is one level bridge over the top.
>

snip

we're arguing about matters regarding the logic of choices (as usual)

then the logic of the name applied to the choice, which gets into 
philosophical arguments which remind me of Plato. 
http://en.wikipedia.org/wiki/Plato

The problem is that at a time in the past a decision was made (Principle A) 
whose logic is now questioned.
A lot has been uploaded onto the server using "Principle A", which will have 
to be reworked if "Principle B" succeeds "Principle A".
So regardless of the logic, people will support "Principle A"  because of the 
work involved in change.
Just look at the work involved by the API change from 0.5 to 0.6


To return to the bridge
the following attributes of the bridge and the road underneath it all need to 
be considered 
Height of bridge
Height above sea level of the bridge
Max height of the arch of the bridge above the roadway
Max height of a vehicle which can drive under the bridge, which if the bridge 
is an arch must be less than the max height of the arch 
Max height of a vehicle which the engineer said was permitted to drive under 
the bridge

so now I have 5 "height" measures
some of which belong to the road and some to the bridge, and some to both.

then we need unambiguous tags to refer to these 5 concepts and translations of 
them all.
:-)










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