I am using SLD to style output from my geoserver. I have couple types of objects to be displayed. Each type have different icons, but text description is generated from the same information (text field in the database). I cannot use object_type as image name because you cannot use variable in image name (or I do not know how to do it...). So I Have SLD like (without unimportant parts):
<StyledLayerDescriptor>
<NamedLayer>
<UserStyle>
<FeatureTypeStyle>
<Rule>
<Filter>
<PropertyIsEqualTo>
<PropertyName>object_type</PropertyName>
<Literal>1</Literal>
</PropertyIsEqualTo>
</Filter>
<PointSymbolizer>
<Graphic>
<ExternalGraphic>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="/images/1.png" />
<Format>image/png</Format>
</ExternalGraphic>
<Size>16</Size>
<Opacity>1</Opacity>
</Graphic>
</PointSymbolizer>
<TextSymbolizer>
<Label>
<ogc:PropertyName>name</ogc:PropertyName>
</Label>
<Font>
<CssParameter name="font-family">Times New Roman</CssParameter>
<CssParameter name="font-style">Normal</CssParameter>
<CssParameter name="font-size">12</CssParameter>
</Font>
<Fill>
<CssParameter name="fill">#110011</CssParameter>
<CssParameter name="fill-opacity">1</CssParameter>
</Fill>
<Halo />
</TextSymbolizer>
</Rule>
<Rule>
<Filter>
<PropertyIsEqualTo>
<PropertyName>object_type</PropertyName>
<Literal>2</Literal>
</PropertyIsEqualTo>
</Filter>
<PointSymbolizer>
<Graphic>
<ExternalGraphic>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink" xlink:type="simple" xlink:href="/images/2.png" />
<Format>image/png</Format>
</ExternalGraphic>
<Size>16</Size>
<Opacity>1</Opacity>
</Graphic>
</PointSymbolizer>
<TextSymbolizer>
<Label>
<ogc:PropertyName>name</ogc:PropertyName>
</Label>
<Font>
<CssParameter name="font-family">Times New Roman</CssParameter>
<CssParameter name="font-style">Normal</CssParameter>
<CssParameter name="font-size">12</CssParameter>
</Font>
<Fill>
<CssParameter name="fill">#110011</CssParameter>
<CssParameter name="fill-opacity">1</CssParameter>
</Fill>
<Halo />
</TextSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
And the thing I'd love to do would be writing TextSymbolizer once and using it in two or more places... I have not heard of anything like that in XML, but maybe you have? :-)
One solution that comes to me, is to write some very simple generator (xml.erb? :P) and let it generate XML...