mapnik/tests/data/good_maps/bool_values.xml

<!DOCTYPE Map>
<Map background-color="#b5d0d0" 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" minimum-version="0.7.2">
    <Style name="test 1">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="true"/>
        </Rule>
    </Style>
    <Style name="test 2">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="yes"/>
        </Rule>
    </Style>
    <Style name="test 3">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="on"/>
        </Rule>
    </Style>
    <Style name="test 4">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="1"/>
        </Rule>
    </Style>
    <Style name="test 5">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="false"/>
        </Rule>
    </Style>
    <Style name="test 6">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="no"/>
        </Rule>
    </Style>
    <Style name="test 7">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="off"/>
        </Rule>
    </Style>
    <Style name="test 8">
        <Rule>
            <PointSymbolizer file="../images/dummy.png" allow-overlap="0"/>
        </Rule>
    </Style>
</Map>