mapnik/tests/data/good_maps/shield_symbolizer.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map  >
<Map background-color="#b5d0d0" srs="+init=epsg:4326" minimum_version="0.7.0">
    <Style name="1">
        <Rule>
            <ShieldSymbolizer
             name="[label]"
             file="../images/dummy.png"
             face_name="DejaVu Sans Book"
             size="10"
             transform="scale(5) translate(15, 15) rotate(20) skewX(20) skewY(5)"
             halo_radius="1"
             dy="-5"
             dx="-5"
             shield_dx="10"
             shield_dy="10"
             no_text="false"
             opacity=".5"
             text-opacity=".3"
             allow_overlap="true"
             avoid_edges="false"
            />
        </Rule>
        <Rule>
            <PointSymbolizer
                allow_overlap="true" />
        </Rule>
    </Style>
    <Style name="2">
        <Rule>
            <LineSymbolizer></LineSymbolizer>
        </Rule>
        <Rule>
            <ShieldSymbolizer
             name="[label]"
             file="../svg/ellipses.svg"
             allow_overlap="true"
             face_name="DejaVu Sans Book"
             size="10"
             no_text="false"
             opacity=".5"
             text-opacity=".3"
             spacing="50"
             line_spacing="10"
             placement="line"
            />
        </Rule>
    </Style>

    <Layer name="line" srs="+init=epsg:4326">
        <StyleName>2</StyleName>
        <Datasource>
            <Parameter name="file">../json/lines.json</Parameter>
            <Parameter name="layer_by_index">0</Parameter>
            <Parameter name="type">ogr</Parameter>
        </Datasource>
    </Layer>

    <Layer name="point" srs="+init=epsg:4326">
        <StyleName>1</StyleName>
        <Datasource>
            <Parameter name="file">../json/points.json</Parameter>
            <Parameter name="layer_by_index">0</Parameter>
            <Parameter name="type">ogr</Parameter>
        </Datasource>
    </Layer>

</Map>