I'm creating a style in geoserver and need to concatenate two different data type (one is string, the other is double) but it's not working. someone can help me? i'm using geoserver 2.16 version and here's the code i've made:
<se:Label>
<ogc:PropertyName>name</ogc:PropertyName>
(<ogc:PropertyName>number</ogc:PropertyName>)
</se:Label>