Dane Springmeyer

/cc @rcoup for help and critque

@rcoup wins: wow - thanks for these excellent ideas. @jhollinger2 - want to digest and provide a new proposal?

/cc @ajashton for thoughts. My gut is that its a step in the right direction but feels to complicated still.

this seems quite useful to fix. I had a quick look but came up empty trying to see where or why this occurs. It seems like `Filterset`s assume `and`. That...

Okay, make sense. Seems like implementing that logic, if doable, would be a solid benefit to both XML load time and Mapnik render time, since it would reduce the #...

@tmcw - would it be more feasible if we did not worry about de-duping? Or, what do you think of @ajashton's idea of a new `key in {list of values`...

cool, more reason for starting to build up a visual test suite

I'm a bit confused here. What exactly is the bug that you each feel exists?

@smsm1 - would you mind pasting a few before/after of the Mapnik XML based on a given change?

thank you @smsm1