[Mapcss] [Proposal] Use "area" pseudo-object rather than way:closed construct; generally, be less OSM-centric

[Chris Browet]

Hi,

I tend to think that the MapCSS syntax is too much OSM oriented in the
current state.
For future version of the specs, I would propose to use more "standard"
object selectors rather than the OSM ones, i.e.:

node -> point
way -> linestring
(area -> polygon)
(relation[type=multipolygon] -> multipolygon)
relation -> (no equivalent)

The general reasoning is that MapCSS could be used to generate maps whatever
the source dataset, so the syntax should be as generic as possible.

For 0.2, I'd suggest already adding an "area" pseudo-object rather than the
very OSM-esque way:closed.

Regards
- Chris -
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