example.mml

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null">
    <Stylesheet>
        Map { map-bgcolor: #ccc; }
    </Stylesheet>
    <Stylesheet src="example.mss"/>
    <Layer id="world-borders" srs="+proj=latlong +ellps=WGS84 +datum=WGS84 +no_defs">
        <Datasource>
            <Parameter name="type">shape</Parameter>
            <Parameter name="file">http://cascadenik-sampledata.s3.amazonaws.com/world_borders.zip</Parameter>
        </Datasource>
    </Layer>
</Map>