format of osm.xml stylesheet

I've set up a tileserver per switch2osm, and it runs as expected. I'd like to experiment with different map styles, so I set up Mapbox's OSMBright and exported it from from TileMill, using TileMill's Export to Mapnik XML option.

I expected to be able to replace the default osm.xml file with the one generated by TileMill, but they have different formats, and renderd rejects the TileMill-generated file.

This is the original osm.xml

This is the TileMill-generated file.

renderd objects straight away to the <Parameters> section in the TileMill file

Running in foreground mode... renderd[22588]: Starting stats thread renderd[22588]: An error occurred while loading the map layer 'default': Unknown child node in 'Map': 'Parameters' renderd[22588]: An error occurred while loading the map layer 'default': Unknown child node in 'Map': 'Parameters' renderd[22588]: An error occurred while loading the map layer 'default': Unknown child node in 'Map': 'Parameters' renderd[22588]: An error occurred while loading the map layer 'default': Unknown child node in 'Map': 'Parameters'

Could anyone explain what I'm missing, and how properly to use the file generated by TileMill?

Thanks, Keith