mapnik/tests/visual_tests/styles/marker-whole-multi-polygon.xml

<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">
    <Parameters>
        <Parameter name="sizes">512,512</Parameter>
    </Parameters>
    <Style name="style">
        <Rule>
            <PolygonSymbolizer fill="white"/>
            <MarkersSymbolizer width="10" stroke-width="0" fill="yellow" allow-overlap="true" ignore-placement="true" multi-policy="each"/>
            <MarkersSymbolizer width="5" stroke-width="0" fill="green" allow-overlap="true" ignore-placement="true" multi-policy="whole"/>
            <MarkersSymbolizer width="3" stroke-width="0" fill="red" allow-overlap="true" ignore-placement="true" multi-policy="largest"/>
        </Rule>
    </Style>
    <Layer name="world" 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>style</StyleName>
        <Datasource>
            <Parameter name="file">../../data/shp/world_merc</Parameter>
            <Parameter name="type">shape</Parameter>
        </Datasource>
    </Layer>
</Map>