file.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map[]>
<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over" background-color="#b8dee6">


<Style name="countries" filter-mode="first">
  <Rule>
    <Filter>([factor] &gt; 50)</Filter>
    <PolygonSymbolizer fill="#eeeeee" />
    <TextSymbolizer name="[ISO_A3]" face-name="Helvetica Regular" />
  </Rule>
  <Rule>
    <Filter>([factor] &lt; 51)</Filter>
    <PolygonSymbolizer fill="#ffffff" />
    <TextSymbolizer name="[ISO_A3]" face-name="Helvetica Regular" />
  </Rule>
  <Rule>
    <TextSymbolizer name="[ISO_A3]" face-name="Helvetica Regular" />
  </Rule>
</Style>
<Style name="countries-outline" filter-mode="first">
  <Rule>
    <LineSymbolizer stroke="#85c5d3" stroke-width="2" stroke-linejoin="round" />
  </Rule>
</Style>
<Layer
      name="countries"
   srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over">
    <StyleName>countries-outline</StyleName>
    <StyleName>countries</StyleName>
    <Datasource>
       <Parameter name="file"><![CDATA[/Users/dmitri/Documents/MapBox/project/foo/layers/countries.SPATIALITE]]></Parameter>
       <Parameter name="table"><![CDATA[(SELECT countries.*, bus2.factor FROM countries LEFT JOIN business.bus2 ON countries.ADM0_A3 = bus2.iso)]]></Parameter>
       <Parameter name="attachdb"><![CDATA[business@/Users/dmitri/ds/tests/business.sqlite]]></Parameter>
       <Parameter name="key_field"><![CDATA[PK_UID]]></Parameter>
       <Parameter name="extent"><![CDATA[]]></Parameter>
       <Parameter name="type"><![CDATA[sqlite]]></Parameter>
       <Parameter name="wkb_format"><![CDATA[spatialite]]></Parameter>
    </Datasource>
  </Layer>

</Map>