Hi Murad,
PropertyName cannot contain an expression (by spec), but there is a filter
function that can do
what you want, it's called "property":
http://docs.geoserver.org/latest/en/user/filter/function_reference.html#feature-functions

So the SLD would look like:

    <sld:Label>
        <ogc:Function name="property">
         <ogc:Function name="env">
          <ogc:Literal>labelField</ogc:Literal>
          <ogc:Literal>room_number</ogc:Literal>
          </ogc:Function>
        </ogc:Function>
      </sld:Label>

This should allow you to choose the property you want the label to display
from the GetMap URL

Cheers
Andrea


On Tue, Sep 8, 2015 at 7:40 AM, Murad Jamal <[email protected]> wrote:

> Hello
>
> Can we use the ALD variable substitution to dynamically tell which
> propertyName to use for label
>
> for example
>
>       <sld:Label>
>         <ogc:PropertyName>
>          <ogc:Function name="env">
>           <ogc:Literal>labelField</ogc:Literal>
>           <ogc:Literal>room_number</ogc:Literal>
>           </ogc:Function>
>         </ogc:PropertyName>
>       </sld:Label>
>
>
> i have tried this and not working
>
> Please help
>
> Regards
>
> Murad
>
>
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