[xsl] Sorting Two Dimensional Table

Hi,
 
I'm desperately trying to sort a two dimension table.
 
I have keys and values. I want to be able to sort by keys and then by value. 
This is not a problem so far. The problem comes when I try to sort the keys 
that I want to be sorted as well.
 
Example: 

x       y       value

a       a       a 
a       b       a 
a       a       b 
a       b       b 
a       a       c 
b       b       a 
b       a       b 
b       b       b 
b       a       d 

which is presented as follow:


        
                a
                b
                halo_name
        
        
        
                
                        
                        
                        d
                
                
                        
                        
                        c
                
                
                        
                        
                        b
                
                
                        
                        
                        b
                
                
                        
                        
                        b
                
                
                        
                        
                        a
                
                
                        
                        
                        a
                
                
                        
                        
                        a
                
                
                        
                        
                        b
                
        

 
Th problem is that I don't know the keys beforhand neither how many of them I 
have. So to show the title of my table, I use something like that:
 










 
 
So that I know that my key titles are always sorted and then I put the data in 
the same fashion
 


















 
 
So I'd like to sort my keys and then sort the data accordingly so that visually 
the first column is sorted first and the second column second...
 
Help !
 
Thank you very much.
 
PL

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