In SLD, how do I add a string to a label describing a property?

Question

Using Geoserver, is there any way that I can add a predefined string: "No. " to a property: postalnumber?

<sld:Label>
<ogc:PropertyName>postalnumber</ogc:PropertyName>
</sld:Label>

Answer 1

The SLD spec includes a string concatenation function. Here's an example of how to use it with labels:

         <Label>
            <ogc:Function name="Concatenate">
              <ogc:Literal>No. </ogc:Literal>
              <ogc:PropertyName>postalNumber</ogc:PropertyName>
            </ogc:Function>
          </Label>

The above was tested on geoserver version 2.1.