geoserver - Creating point symbology in SLD file

I would like to create a style file for a layer in Geoserver. I have point geometries and the SLD cookbook does give nice examples for the simple ways to create your symbology.

However, I would like to combine the attribute dependent way and the scale dependent way. My points need to be colored depending on some attribute value and change size depending on the zoom level.

Does anybody have an example on how to do this or even some link where more complicated version of SDL files are available?

Answer

With Rule based SLDs, you need to set up a rule for each case. You cannot nest rules.

In the following example, I want to use attribute based rendering for scale<25000. In this case if the height is deeper than -10, I want a red marker, otherwise I want a green marker.
For map scale>250000, I want a small blue marker.

Thus there need to be 3 rules.

  
    GPS_points
    
      

        
          GPS_points
          
          
            
              height
              -10
            
          
          100

          250000
         
            
              
                circle
                
                  #cc0123
                  1.0
                
              

              3
              0
            
          
        
        
          GPS_points
          
          
            

              height
              -10
            
          
          100
          250000
          
            
              
                circle

                
                  #11cc99
                  1.0
                
              
              3
              0
            
          
        

        
          GPS_points
          
          250000
          
            
              
                circle
                
                  #110cd3

                  1.0
                
              
              1
              0