wrote:
> Interesting ideas.
> 
> Consider whether to only allow users to add data (such as uploading to 
> YouTube), or whether people can interact in the data (YouTube members 
> can comment on videos by others) or interact on the map (letting people 
> modify objects which already exist).
> 
Yeah, commenting and rating are clearly on my roadmap for this.  As for 
interacting with the map, I'd like to at least see users be able to open 
their data to others for modification.

> Should there be a full modification history, so people can see the 
> changes, undo changes, and bookmark a specific version?  For that 
> matter, what is a version -- the entire globe at one point in time, one 
> specific dataset, or the datasets which one person has open?  One can 
> create a map by choosing parts of existing data, so can such 
> combinations be saved as an object which others can interact with?

Yeah, full modification is something we're interested in, and have 
already built a pretty decent backend, see 
http://geoserver.org/display/GEOS/Versioning+WFS

Though a crazy distributed modification history would be awesome, the 
way I'd start (and am starting), is to tie modification history to an 
individual data layer.  A user has ownership over that, and can choose 
to open it to others.  So it'd be like open source software, with a 
central repository that is the definitive version.  Eventually would 
support branches, but there would still be the notion of the dataset. 
So in composing a map you'd pick the data layers, and if you wanted to 
change those you'd have to get your contributions back to the original, 
or else go through a major act of 'forking', establishing your own 
definitive version.

But no matter what I'd like to see a user able to upload data and then 
encourage others to edit it, and versioning changes should help a lot 
for people to feel better about opening up their data.

best regards,

Chris

-- 
Chris Holmes
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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