Hi I am trying to write a geometry function inside an SLD which calculates the 
difference.

<Rule>
        <Filter>
            <Difference>
       <PropertyName>GEOMETRY</PropertyName>
       <Literal>
         ?????????????????
       </Literal>
</Difference>
         </Filter>

         <LineSymbolizer>
                <Geometry>
                    <PropertyName>center-line</PropertyName>
                </Geometry>
                <Stroke>
                    <CssParameter name="stroke">#0000ff</CssParameter>
                    <CssParameter name="stroke-width">2.0</CssParameter>
                </Stroke>
           </LineSymbolizer>
        </Filter>
    </Rule>


I can´t any examples of this type


thanks for any clues.

Rob
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