bkil.hu+Aq at gmail.com
Wed Oct 10 05:54:01 UTC 2018
Do note that fire hydrant plates depict opening direction, so if we
would need to store direction to close, a mapper would yet again need
to do mental work, that is not error prone and confusing.
On Wed, Oct 10, 2018 at 12:31 AM François Lacombe
<fl.infosreseaux at gmail.com> wrote:
> The question about the opening direction should be propagated to this draft proposal regarding pipeline valves
> I thought about turn_to_close=clockwise / anticlockwise
> Whatever the final answer will be, this definitely have to be the same key and values on both fire hydrants and any kind of pipeline valves.
> The proposal can change at anytime until RFC.
> All the best
> Le mar. 9 oct. 2018 à 23:13, Paul Allen <pla16021 at gmail.com> a écrit :
>> On Tue, Oct 9, 2018 at 9:34 PM Viking <viking81 at tin.it> wrote:
>>> As we did for most of the tags in , I would not use fire_hydrant: prefix because we want a slim
>>> database and because opening:direction=* is (or can be) used for other objects, as doors, taps, etc.
>> There are differing viewpoints on this.
>> 1) Minimize database keys by applying them as widely as possible. So opening:direction applies to
>> doors, taps, fire hydrants, etc. Database designers might think this way, as might most ordinary
>> mappers and most programmers.
>> 2) Don't re-use keys in this way because you end up with different sets of values that apply in
>> different situations. People who program map editors tend to think this way. Each time you use
>> opening:direction for a different type of object the programmer has to special-case the set of possible
>> values based on the associated values in order to populate drop-downs. If you're mapping a
>> tap you want the choice of opening:direction to be limited to clockwise and counterclockwise and
>> not be confused by also seeing inwards and outwards; but for doors you want inwards and outwards
>> but not clockwise and counterclockwise (unless it's a rotating door).
>> I can see merits in both viewpoints. The people who write map editors tend to win these arguments
>> because most mappers choose from what the editor presents to them. :)
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