[OSM-dev] What about sharing basic rendering rules and using SLD?

[Stefan Keller]

There are currently at least three rendering tools, Mapnik, Osmarender and
Kosmos and all are struggling to remain updated on all these keys.

=> What about sharing symbolization (= rendering) rules among all renderers?

There are already some examples around like in Kosmos, where it says that
"people are sharing their rendering rules in Category:Kosmos rules" (c.f.
http://wiki.openstreetmap.org/index.php/KosmosStandardRules ). These rules
could be overwritten by local/specialized ones (as proposed by ISO 19117 -
Portrayal). But what's lacking in all these examples I've seen so far, is a
rendering priority, a symbology and - before all - a machine readable common
syntax.

=> So, what about using SLD? (See e.g.
http://geoserver.org/display/GEOSDOC/SLD+Snippets). Out of SLD one could
then generate standard rendering rules for all three tools.
Any comments or proposals on this?
-- Stefan
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