XSLT Concat fields together

Question

i am trying to filter on a specific field and concat on another field:

Input:

    &         


        

Answer 1

Use this template:

    
    
    

    
        
            
            
            
                
                    

                    
                        ,
                    
                
            
        
    

    

    
        
            
        
    

When applied to provided input XML, it outputs wanted correct result:

  
    michael
    brown
    1,2,3