Hi,

I always have problems with xml, sld and understanding the context, syntax and 
rules which one has to know in order to make a valid sld file.

Does anyone have any "easy to understand" literature or tutorials regarding 
sld, 
namespaces and when one should use <sld:></sld>, <ogc:></ogc>, <css:></css>, 
<xsi:></xsi> etc etc...

I have read the geoserver docu regarding styling and sld“s but I still have 
limited understanding about the prefixes/namespaces etc. Or if it is so easy, 
maybe someone coold write a few lines explaining the rules to me....

<FeatureTypeStyle>

           <Rule>
             <ogc:Filter>
            <ogc:PropertyIsEqualTo>
              <ogc:PropertyName>grenze</ogc:PropertyName>
              <ogc:Literal>Landkreis/Stadt</ogc:Literal>
            </ogc:PropertyIsEqualTo>
             </ogc:Filter>
              <sld:MinScaleDenominator>300000</sld:MinScaleDenominator>
          <sld:MaxScaleDenominator>9000000</sld:MaxScaleDenominator>
             <TextSymbolizer>
               <Label>
                 <ogc:PropertyName>GNAME</ogc:PropertyName>
               </Label>
               <Font>
                 <CssParameter name="font-family">Arial</CssParameter>
                 <CssParameter name="font-size">12</CssParameter>
                 <CssParameter name="font-style">normal</CssParameter>
                 <CssParameter name="font-weight">bold</CssParameter>
               </Font>
               <LabelPlacement>
                 <PointPlacement>
                   <AnchorPoint>
                     <AnchorPointX>0.5</AnchorPointX>
                     <AnchorPointY>0.0</AnchorPointY>
                   </AnchorPoint>
                   <Displacement>
                     <DisplacementX>0</DisplacementX>
                     <DisplacementY>25</DisplacementY>
                   </Displacement>
                 </PointPlacement>
               </LabelPlacement>
               <Fill>
                 <CssParameter name="fill">#990099</CssParameter>
               </Fill>
             </TextSymbolizer>
           </Rule>
         </FeatureTypeStyle>

I wrote this and I receive an error that "The prefix "sld" for element 
"sld:MinScaleDenominator" is not bound."...????

Thanks,


Robert Buckley



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