GeoServer CSS rotation with env and property name

Using GeoServer CSS extension

 mark-rotation:  [env('rot',2)];

ends in

    
        
            rot
            2
         
     

How should my style look like to add a property name to rotation:

 
                   

    mystyle
       
          rot
          2
       
    
  

I have tried

 mark-rotation:  [env('rot',2),mystyle];

 mark-rotation:  [mystyle],[env('rot',2)];

Answer

To produce a rotation of ( the rot variable or 2 ) plus the value of the property mystyle you should use:

mark-rotation: [env('rot',2)+mystyle]; 

To generate SLD that uses rot, followed by mystyle, or 2 you should use something like (and I haven't tested this). If it doesn't work you can check the syntax page:

mystyle is null {
  mark-rotation:  [env('rot',2)]
}
mystyle is not null {  

  mark-rotation: [mystyle];
}