[Community] Transparent Polygons

[Ludwig M Brinckmann]

I have a number of polygon layers that stack on top of each other. With the 
new SVN version (pre-0.6) I do not seem to be able to make the interior of 
them transparent any more, meaning that top layers always black out lower 
layers.

I assume that the fill opacity box in the polygon symbolizer is supposed to 
deal with it, but neither setting it to 0 nor to 1 (I am never 100% sure 
which way it works) seems to make the interior transparent.

Am I missing something?

Ludwig