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Hi !

The "ELSE" rule in rule based symbology is extremely useful. But when exporting to SLD, the rule gets transformed to :

...
      <se:FeatureTypeStyle>
        <se:Rule>
          <se:Name>A regular rule that works well</se:Name>
          <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc">
            <ogc:Not>
              <ogc:PropertyIsNull>
                <ogc:PropertyName>waterway</ogc:PropertyName>
              </ogc:PropertyIsNull>
            </ogc:Not>
          </ogc:Filter>
          ...
        </se:Rule>
        <se:Rule>
          <se:Name>All other features</se:Name>
          <!--Parser Error: syntax error, unexpected ELSE - Expression was: ELSE-->
          ...
        </se:Rule>
...

So we get that <!--Parser Error...--> block instead of the whole <ofc:Filter> block.

This means that there's no filter for that rule, making it apply to all features, and thus making the map unreadable.

I don't know if SLD allows for something like "ELSE" ? If not, maybe we could just simulate it by using <ogc:Not> filter and putting all other layers conditions in there ? That may be a bit messy for complex rules... but would work well for simple ones, and would be consistent with what we do for rules groups.

Thanks !!