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Hi, I'm currently using geoserver 2.0.2, and it is to my understanding that it should be possible to filter a set of features using the tag "LayerFeatureConstraints" in the sld. According to the xsd the LayerFeatureConstraint should contain a FeatureTypeConstraint node, which can constrain the features to a specific feature-type as well as giving the opportunity to supply a filter. But I can't get this to work. I've done some test simply with the demo-data that follows the installation, working with topp:states and the "population" style. The original style contains multiple Rules that specifies certain fill-colours depending on the PERSONS property, and the layer preview tells me that this works. Then I've simplified the population style, keeping one "generic" rule that sets the same fill-colour to all polygons, but instead I try to apply a LayerFeatureConstraint to only give me the features that have less than 2000000. But it doesn't work. My Sld definition is like this: <?xml version="1.0" encoding="ISO-8859-1"?> <StyledLayerDescriptor version="1.0.0" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:gml="http://www.opengis.net/gml" xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd"> <NamedLayer> <Name>USA states population</Name> <LayerFeatureConstraints> <FeatureTypeConstraint> <ogc:Filter> <ogc:PropertyIsLessThan> <ogc:PropertyName>PERSONS</ogc:PropertyName> <ogc:Literal>2000000</ogc:Literal> </ogc:PropertyIsLessThan> </ogc:Filter> </FeatureTypeConstraint> </LayerFeatureConstraints> <UserStyle> <Name>population</Name> <Title>Population in the United States</Title> <Abstract>A sample filter that filters the United States into three categories of population, drawn in different colors</Abstract> <FeatureTypeStyle> <Rule> <Title>All states</Title> <PolygonSymbolizer> <Fill> <!-- CssParameters allowed are fill (the color) and fill-opacity --> <CssParameter name="fill">#4DFF4D</CssParameter> <CssParameter name="fill-opacity">0.7</CssParameter> </Fill> </PolygonSymbolizer> </Rule> </FeatureTypeStyle> </UserStyle> </NamedLayer> </StyledLayerDescriptor> Could anyone please supply me with some information regarding this? Am I using it incorrectly, or can it not be used like this? For me it seems like whatever I try to use in the ogc:Filter is simply ignored, unless the filter is put under a Rule node. Then it works immediately. I have tested this using both shapefiles and layers served from postgresql, and tried also with a spatial filter (bounding box) and featureId filter, but neither seem to make a difference - all features are displayed. Regards, Eivind Roennevik |
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