web-server/doc/en/user/source/styling/sld/cookbook/artifacts/point_attribute.sld

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    <Name>Attribute-based point</Name>
    <UserStyle>
      <Title>GeoServer SLD Cook Book: Attribute-based point</Title>
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            <ogc:PropertyIsLessThan>
              <ogc:PropertyName>pop</ogc:PropertyName>
              <ogc:Literal>50000</ogc:Literal>
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          <PointSymbolizer>
            <Graphic>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">#0033CC</CssParameter>
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              <Size>8</Size>
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          </PointSymbolizer>
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                <ogc:Literal>100000</ogc:Literal>
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          <PointSymbolizer>
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              <ogc:PropertyName>pop</ogc:PropertyName>
              <ogc:Literal>100000</ogc:Literal>
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          <PointSymbolizer>
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              <Mark>
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