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

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    xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd" 
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    xmlns:xlink="http://www.w3.org/1999/xlink" 
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  <NamedLayer>
    <Name>Dashed line</Name>
    <UserStyle>
      <Title>SLD Cook Book: Offset line</Title>
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          <LineSymbolizer>
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              <CssParameter name="stroke">#000000</CssParameter>
            </Stroke>
          </LineSymbolizer>
          <LineSymbolizer>
            <Stroke>
              <CssParameter name="stroke">#FF0000</CssParameter>
              <CssParameter name="stroke-dasharray">5 2</CssParameter>
            </Stroke>
            <PerpendicularOffset>5</PerpendicularOffset>
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