To anyone who can show me what I broke:

http://geo.topf.org/comparison/index.html?mt0=mapnik&mt1=tah&x=971&y=657&z=11

I worked on this pair of lakes in NW Ireland a few days ago. The
Osmarender output is broken, but I decided to wait for Mapnik to
re-render before panicking. Let the panic begin...

Before I started, the lakes were represented as an extremely deep
"inlet", whereby the original import of the Irish coastline had simply
followed the river Moy inland. The islands in the lakes where
similarly modelled by coastline ways pointing in the correct
direction. It all looked OK apart from the rivers, which were broken
up and a bit ugly.

So I decided to fix them. Rather than follow my usual practice of
representing islands in lakes as land at layer 1 I decided to use
relations to model them as holes in the water. Something has gone
wrong, though, as can be seen from the rendered output, but my data
looks clean to me in the editor and I think I've followed the
guidelines on polygons with holes. (Though the lakes do have quite a
few nodes, so maybe I'm just putting too much load on the [EMAIL PROTECTED]
clients).

Can anyone spot my mistake?
Dermot

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