Hi Andrea;
> Ok, since Geoserver is depending on FeatureReader and FeatureResult in
> a million of places, I'd like to find docs explaining why we are 
> changing this, where does the feature collection fever comes from, what
> are the benefits.
The move away from FeatureResults was a request by Chris Holmes and 
James, there is still a wiki page based on an email called "bring back 
feature collection" here:
- http://docs.codehaus.org/display/GEOTOOLS/Bring+Back+FeatureCollection

The decision was made back in 2004; I am just slow.
> I want a good reason to rewrite/patch good part of the geoserver code 
> base (the WFS module in particular).
The good part for GeoTools is less of our own code for people to learn; 
If you like DataFeatureCollection can maintain a reader() method - we 
have implementations that wrap around a normal Iterator. All of the 
FeatureResult methods have been deprecated; and their FeatureCollection 
counter parts have been available.

Cheers,
Jody

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