[Tile-serving] [osm2pgsql-dev/osm2pgsql] Style file to only use nodes that my ways use (Discussion #2311)

[Jochen Topf]

There is currently no direct way to do this. But you can get the geometry of a way (`object:as_linestring()`) and you can get all the ids of the member nodes (`object.nodes`) in the way callback. And you can import all the nodes with certain tags (say `barrier`) into the database. Then you can do some post-processing in the database to assemble the data again. But the details depend on what exactly you are trying to achive. If you tell us more about your use case maybe we can give a more concrete answer how to solve that.

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