How do I make items optional in ?

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情书的邮戳 2020-12-18 22:43
I have such xsd. These all fields can exist or not and in unpredictable order.

      
      
        
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                   误落风尘
                                             
                
                
                (楼主)
            
              
              
                2020-12-18 23:42
              

            
            
                        
try like this in all

 

    
             
                                                        
            
            
              
                
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