mapnik/tests/visual_tests/styles/point-symbolizer-overlap-placement-expr.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map>
<Map background-color="white" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
  <Parameters>
    <Parameter name="sizes">500, 500</Parameter>
  </Parameters>
  <FontSet name="book">
    <Font face-name="DejaVu Sans Book"/>
  </FontSet>

  <Layer name="layer" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
    <StyleName>My Style</StyleName>
    <Datasource>
      <Parameter name="type">csv</Parameter>
      <Parameter name="extent">-0.5, -0.5, 0.5, 0.5</Parameter>
<Parameter name="inline">
lat,long,overlap,placement
 0.33,-0.36,noexpr-true,noexpr-false
 0.33,-0.34,noexpr-true,noexpr-false
 0.33,-0.13,noexpr-false,noexpr-false
 0.33,-0.11,noexpr-false,noexpr-false
 0.33, 0.10,noexpr-true,noexpr-false
 0.33, 0.12,noexpr-false,noexpr-false
 0.33, 0.34,noexpr-false,noexpr-false
 0.33, 0.36,noexpr-true,noexpr-false

 0.11,-0.36,true,false
 0.11,-0.34,true,false
 0.11,-0.13,false,false
 0.11,-0.11,false,false
 0.11, 0.10,true,false
 0.11, 0.12,false,false
 0.11, 0.34,false,false
 0.11, 0.36,true,false

-0.11,-0.36,noexpr-false,noexpr-true
-0.11,-0.34,noexpr-false,noexpr-true
-0.11,-0.13,noexpr-false,noexpr-false
-0.11,-0.11,noexpr-false,noexpr-false
-0.11, 0.10,noexpr-false,noexpr-true
-0.11, 0.12,noexpr-false,noexpr-false
-0.11, 0.34,noexpr-false,noexpr-false
-0.11, 0.36,noexpr-false,noexpr-true

-0.33,-0.36,false,true
-0.33,-0.34,false,true
-0.33,-0.13,false,false
-0.33,-0.11,false,false
-0.33, 0.10,false,true
-0.33, 0.12,false,false
-0.33, 0.34,false,false
-0.33, 0.36,false,true
      </Parameter>
    </Datasource>
  </Layer>

    <Style name="My Style" filter-mode="first">
    <Rule>
      <Filter>[overlap] = "noexpr-true" and [placement] = "noexpr-true"</Filter>
      <PointSymbolizer allow-overlap="true" ignore-placement="true" file="../../data/svg/point_sm.svg" />
    </Rule>
    <Rule>
      <Filter>[overlap] = "noexpr-true" and [placement] = "noexpr-false"</Filter>
      <PointSymbolizer allow-overlap="true" ignore-placement="false" file="../../data/svg/point_sm.svg" />
    </Rule>
    <Rule>
      <Filter>[overlap] = "noexpr-false" and [placement] = "noexpr-false"</Filter>
      <PointSymbolizer allow-overlap="false" ignore-placement="false" file="../../data/svg/point_sm.svg" />
    </Rule>
    <Rule>
      <Filter>[overlap] = "noexpr-false" and [placement] = "noexpr-true"</Filter>
      <PointSymbolizer allow-overlap="false" ignore-placement="true" file="../../data/svg/point_sm.svg" />
    </Rule>
    <Rule>
      <PointSymbolizer allow-overlap="[overlap]" ignore-placement="[placement]" file="../../data/svg/point_sm.svg" />
    </Rule>
  </Style>

</Map>