mapnik/tests/visual_tests/styles/marker-vs-point.xml

<Map srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
     background-color="green"
     background-image-opacity="0.8"
     background-image-comp-op="screen"
     background-image="../data/pattern.png">
  <Parameters>
    <Parameter name="sizes">512,512</Parameter>
  </Parameters>

  <Style name="markers">
    <Rule>
      <MarkersSymbolizer
	  width="60"
	  height="60"
	  file="../../data/svg/transparent_circle.svg"
	  />
    </Rule>
  </Style>

  <Style name="points">
    <Rule>
      <PointSymbolizer
	  file="../../data/svg/transparent_circle.svg"
	  />
    </Rule>
  </Style>

  <Layer name="layer" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>markers</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
x,y
-2.5,3
-2.5,0
-2.5,-3
      </Parameter>
    </Datasource>
  </Layer>

  <Layer name="layer" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>points</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
x,y
2.5,3
2.5,0
2.5,-3
      </Parameter>
    </Datasource>
  </Layer>

  <!-- points to frame data view -->

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

  <Layer name="frame" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>frame</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="inline">
x,y
-5,-5
5,-5
-5,5
5,5
      </Parameter>
    </Datasource>
  </Layer>

</Map>