card9 DTD:
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CARD

CARD
 |_(disc)+
     |_(pearnum,
     |   |_(#PCDATA)+
     |  
     |__peartext)+
         |_(utter)+
             |_(num,
             |   |_(maj,
             |   |   |_(#PCDATA)
             |   |  
             |   |__min)+
             |       |_(#PCDATA)
             |      
             |  
             |__pphr)+
                 |_((refexp |
                 |    |_(refexp | ...
                 |    |__#PCDATA)*
                 |   
                 |___#PCDATA)+,
                 |__btone)
                     |_(fall |
                     |   |_(#PCDATA)?
                     |  
                     |__rise |
                     |   |_(#PCDATA)?
                     |  
                     |__continue)?
                         |_(#PCDATA)?
                        
                    
                
            
        
    

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