On 28.03.2010 21:43, WanMil wrote:

At the moment processing of multipolygon boundary relations creates a lot of unwanted effects (artificial boundaries on tile bounds, lots of warnings etc.).

The patch excludes the boundary relations from the multipolygon processing. This can be changed with the new option --process-boundary-relations.

An additional spin-off is the improved performance and less warnings.

WanMil
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For me the patch works very well (I don't know of any reason why I would need to have this behaviour tuneable via style-file, but as often, needs only arise once it is possible). Especially the annoying border artefacts of borders on the geofabrik cuttings are gone....
....
However even though I don't really know if it is the same reason. When compiling contourlines, there are also very often straight artefact lines crossing the whole image, maybe the same patch should be used when outputting lines 0x20-0x26 and 0x17??? (these are the contourline regions, and cannot be used for other features)