[Tagging] area=yes on polygones (was Block names)

[Tobias Knerr]

Anthony wrote:
>
>> "area=no" can be considered a "sic!", but that tag should never have any
>> actual effect.
> 
> Effect on what?

On renderers or any other applications working with OSM data.

>  If I were writing a renderer, I would assume that a
> closed way railway=platform represented an area unless it was tagged
> area=no.  So that's an effect.

If I were writing a renderer (actually, I am), I would assume that a
closed way does not represent an area unless it
a) has an always-area tag such as landuse
or
b) is tagged with area=yes.

Your idea that some tags should make a closed way into an area by
default, unless there's also a certain other tag (like area=no) present,
is not established mapping style as far as I can tell.

Currently, tags are either unambiguous, or the default assumption is
"not an area".

Tobias