mapnik/tests/visual_tests/styles/group-symbolizer-1.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Without unlock-image -->
<!DOCTYPE Map>
<Map background-color="green" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" minimum-version="2.0.0">

  <Layer name="layer" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>points</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
lat,long,name1,ref1,name2,ref2
0,0,One,1,Two,2
      </Parameter>
    </Datasource>
  </Layer>

  <Style name="points">
    <Rule>
      <GroupSymbolizer start-column="1" num-columns="2" placement="point" avoid-edges="false" minimum-distance="10" spacing="20" repeat-key="[name%]+'-'+[ref%]">
        <PairLayout item-margin="1"/>
        <GroupRule>
          <MarkersSymbolizer file="shape://ellipse" width="20" height="15"/>
          <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" dy="10">[name%]</TextSymbolizer>
          <TextSymbolizer face-name="DejaVu Sans Book" size="16" placement="point" dy="-10">[ref%]</TextSymbolizer>
        </GroupRule>
      </GroupSymbolizer>
    </Rule>
  </Style>

  <Layer name="layer2" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>frame</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
lat,long,nr
-1,-1,0
-1,1,1
1,-1,2
1,1,3
      </Parameter>
    </Datasource>
  </Layer>

  <Style name="frame">
    <Rule>
      <PointSymbolizer/>
    </Rule>
  </Style>

  <Layer name="layer3" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>center</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
lat,long,nr
0,0,0
      </Parameter>
    </Datasource>
  </Layer>

  <Style name="center">
    <Rule>
      <PointSymbolizer allow-overlap="true" ignore-placement="true" file="../../data/raster/white-alpha.png"/>
      <DebugSymbolizer/>
    </Rule>
  </Style>

</Map>