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                            ## XML約束
就是限制XML的作用.常見約束DTD,Schema.

1. 可以約束標簽名.
2. 可以約束屬性.
3. 約束子標簽
4. 約束子標簽屬性.
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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