Taginfo allows projects to define a list of tags they use, which then
appear in http://taginfo.openstreetmap.org/projects. Osm2pgsql style
files define a list of tag keys that are used by osm2pgsql, if the keys
are for nodes, ways, or both, and if the keys cause an object to be an area.
I wrote some code to turn style files into taginfo project json:
https://github.com/osmlab/osm2pgsql_taginfo
Any project using osm2pgsql with default settings is using a subset of
those tags.
It's not the most useful utility but there's a chance it might be useful
for someone else.
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