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When attempting to fetch a legend that contains only a single rule set, the text from that legend is dropped from the output, leaving only the graphic element.
Example from GeoServer’s default Line style SLD:
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
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">
<!-- a named layer is the basic building block of an sld document -->
<NamedLayer>
<Name>Default Line</Name>
<UserStyle>
<!-- they have names, titles and abstracts -->
<Title>A boring default style</Title>
<Abstract>A sample style that just prints out a green line</Abstract>
<!-- FeatureTypeStyles describe how to render different features -->
<!-- a feature type for lines -->
<FeatureTypeStyle>
<!--FeatureTypeName>Feature</FeatureTypeName-->
<Rule>
<Name>Rule 1</Name>
<Title>Blue Line</Title>
<Abstract>A blue line with a 2 pixel width</Abstract>
<!-- like a polygonsymbolizer -->
<LineSymbolizer>
<Stroke>
<CssParameter name="stroke">#0000FF</CssParameter>
</Stroke>
</LineSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
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