[Tagging] waterway=derelict_canal

[Mateusz Konieczny]

On Tue, 25 Aug 2015 15:20:10 -0700
Paul Norman <penorman at mac.com> wrote:

> On 8/24/2015 3:35 PM, Andy Townsend wrote:
> > That's not so bad in lua, but imagine writing "... and not 
> > disused=yes" into every cartocss rule! 
> 
> Fortunately, we will not have to do that in OpenStreetMap Carto, as
> we will not be supporting the style of tagging where one tag says
> what something is, then another tag saying it's not really that, but
> used to be, or will be. We do not want to encourage the use of
> disused=yes, abandoned=yes, or similar tags.

Yes, [amenity=hotel, involuntary=yes] is a poor way to tag prison in
the same yes as using [shop=convenience; disused=yes] is a poor way to
tag something where only remains of shop are present and it is
impossible to buy anything.

This type of trolltags is really irritating - and in general it is a
tagging for renderer to force data consumers to process objects that are
no longer existing.