On May 10, 2011, at 11:30 AM, Samuel M. Smith wrote:

> The mapnik "map" and mapnik "layers" each have an srs (spatial reference 
> system) attribute. 
> If the srs of a layer differs from the map srs does mapnik automatically 
> reproject the layer data 
> to the map's srs when rendering?

Yes. Reprojection is done during rendering when the strings for each srs do not 
match exactly. 

> Or does one have to manually reproject somhow?
> Assuming vector datasources
> 
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