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                            DEFINED標簽用于判斷某個常量是否有定義，用法如下：

~~~
<defined name="NAME">
NAME常量已經定義
</defined>
~~~
> name屬性的值要注意嚴格大小寫

如果判斷沒有被定義，可以使用：

~~~
<notdefined name="NAME">
NAME常量未定義
</notdefined>
~~~
可以把上面兩個標簽合并成為：

~~~
<defined name="NAME">
NAME常量已經定義
<else /> 
NAME常量未定義
</defined> 
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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