Chris,

My approach would be to use the geometric transformation "buffer" several times 
on the polygon. Using a negative value, you would get polygons smaller than the 
input area. with every transformation you set a different colour to achieve a 
fading line effect, though generated using polygons.

Kind regards,

Edward

From: cha...@airdata.co.uk
To: geoserver-users@lists.sourceforge.net
Date: Fri, 11 Jan 2013 08:10:38 -0500
Subject: [Geoserver-users] Polygons with outlines using gradients

Hello all, Is it possible to style polygons so that their outline appears as a 
gradient? I’d like to define a coastline, for example, using a line that is, 
say 5 pixels wide, but whose colour fades to transparent. The gradient should 
be oriented with the solid colour closest to the inside of the polygon and the 
lighter colour furthest away from the polygon. Not the best explanation, but 
hopefully you will understand what I mean! Thanks Chris*** This communication 
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