>> There are literally hundrets of building which have 4 edges as nodes
>> but them beeing connected over cross so that a construct like a
>> butterfly resembles.
>
> Any chance of a link to an example?

  I guess Florian ment geometries like this:
  http://www.openstreetmap.org/way/460032394

  There are indeed plenty of these in "less populated" areas,
especially areas with round buildings...

-- 
Tomas

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