mapnik/tests/data/good_maps/point_json.xml

<!DOCTYPE Map>
<Map background-color="#b5d0d0" srs="+init=epsg:4326" minimum-version="0.7.2">
    <Style name="1">
        <Rule title="foo">
            <Filter>([x]=0)</Filter>
            <TextSymbolizer size="10" dy="-10" face-name="DejaVu Sans Book" halo-radius="1" allow-overlap="true">[label]</TextSymbolizer>
            <PointSymbolizer/>
        </Rule>
        <Rule title="foo">
            <Filter>([y]=0)</Filter>
            <TextSymbolizer size="10" dy="5" face-name="DejaVu Sans Book" halo-radius="1">[label]</TextSymbolizer>
            <PointSymbolizer/>
        </Rule>
        <Rule title="foo">
            <ElseFilter/>
            <TextSymbolizer size="10" dy="-5" face-name="DejaVu Sans Book" halo-radius="1">[label]</TextSymbolizer>
            <PointSymbolizer/>
        </Rule>
        
    </Style>

    <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>