Hi all,
I just added a GeoServer archetype for creating WFS output formats. I also did up a tutorial for them:
http://geoserver.org/display/GEOSDOC/Creating+a+WFS+Output+Format
At your leisure check it out and let me know what you think. Seb is going to be trying it out soon so we should have some good feedback on it.
-JD
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Justin Deoliveira
Software Engineer, OpenGeo
http://opengeo.org