Open source command line tool for Linux to diff XML files ignoring element order

Question

Is there an open source command-line tool (for Linux) to diff XML files which ignores the element order?

Example input file a.xml:

Answer 1

if you wanted to take this to an arbitrary degree, you could implement something that walks the two trees together and decides along the way which elements "match" between the two documents. that'd let you implement the matching logic any way you want. here is an example in xslt 2.0:

    

    

    
        
            
             
        
    

    

    
        
        
        
    

    
        
        
        
        
    

    
        
        
        
            
        
    

    

    
    
        
        

        
            
                
                
            
        

        
            
                FAIL
            
            
                PASS
            
        

    

    
    
        
        
            
                
            
            
                
            
            
                
            
        
    

    
    
        
        
    

    
    
        
    

    
    
        
            
        
    

    
    
        
    

    
    
        
            
        
    

    
    
        

        
            
                
                
            

            
                
                    
                
                
                    
                        
                        
                    
                
            
        

    

    
    
        
        
        

        
            
                
                
                    
                        
                    
                

                
                    
                        
                        
                            
                            
                            
                        
                    
                    
                        
                            
                            
                            
                        
                    
                

            
            
                
                    
                
                
                    
                
            
        

    

    
    
        
        

        

        
            
                
                    
                        
                    
                

                
                    
                        
                            
                        
                    
                    
                        
                    
                
                
                    
                    
                
            
            
                
            
            
                
            
        

    

applied to this document (based on your test case), the result is PASS: