Hello. I've a problem generating the XML of a SLD from instances of styles using the SLDTransformer. In some point in my code, I have something like this:

SLDParser sldParser = new SLDParser(new StyleFactoryImpl());
FilterFactory ff = new FilterFactoryImpl();
FeatureTypeStyle fts;
Style style;
SLDTransformer sldTransformer = new SLDTransformer();


CompareFilter f = ff.createCompareFilter(Filter.COMPARE_NOT_EQUALS);
LiteralExpression val = ff.createLiteralExpression(DELETED_ATTRIBUTE);   // DELETED_ATTRIBUTE and MODIFIED_ATTR are constants defined elsewhere
f.addLeftValue(ff.createAttributeExpression(MODIFIED_ATTR));
f.addRightValue(val);


sldParser.setInput(url);                    // A predefined URL
style = sldParser.readXML()[0];

fts = style.getFeatureTypeStyles()[0];
rule = fts.getRules()[0];
rule.setFilter(f);

sldTransformer.transform(style, fileWriter); // fileWriter created elsewhere


Well, when I look into the generated XML, in the section corresponding to the added filter, i get

<ogc:Filter>
   <ogc:null>
      <ogc:PropertyName>modified</ogc:PropertyName>
      <ogc:Literal>3</ogc:Literal>
   </ogc:null>
</ogc:Filter>

where, I think, <ogc:null> should be <ogc:PropertyIsEqualTo>

When I parse the XML, an exception is thrown and I can't load the style.

Has anyone ever had this problem before? I have no idea if it's something i'm making wrong or no. I'm using geotools 2.2RC3.

Thanks very much,
Antonio Grassi


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