For the barrier=city_wall I in fact see way AND area as possible:
A mid-age city wall of a bigger city may have walls of several meters
width sometimes, that include corridors, stairways and more, as another
building would.
If I map a strip of grass as an area with a width of 1m, a city wall
with 5m width is an area, too - that's sometimes similar in size than a
usual house.
I think, we should (!) introduce an area tag in the next API version,
that allows the strict distinction between area and way by type,
independent of tags.
regards
Peter
Am 28.04.2012 15:39, schrieb Anthony:
On Sat, Apr 28, 2012 at 9:16 AM, Tobias Knerr<o...@tobias-knerr.de> wrote:
Right now, we already have to distinguish three types of tags:
* always area
* always way
* way unless area=yes is present.
I simply do not think that the possibility to decrease of the number of
tags is worth introducing "area unless area=no is present" in addition
to these. Particularly because whether area or way is the default would
depend on what is assumed to be more likely in reality. And people might
easily have different assumptions here, making that kind of default
non-obvious.
I don't see how we'd be adding any more confusion by adding a fourth
type. Right now if someone tags something as railway=platform they
have to figure out whether it is "always area" (*) or "way unless
area=yes is present", and this is not at all obvious.
Even more confusing are the barrier=* tags. I think they are of the
type "always way", but I'm not 100% sure about that. The wiki lists
barrier=city_wall as being a way or an area. But I think by area they
just mean closed way. Is barrier=city_wall "always area" (*), "always
way" or "way unless area=yes is present"? How is someone supposed to
figure this out?
Allowing area=no provides a simple method of dealing with cases where
you are unsure: just tag area=yes/no explicitly.
(*) I note, here, that "always area" doesn't mean "the way always
represents an area", it means "the way always represents an area when
it is closed".
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