Using Count() conditionally ??

Hi ..
     I am trying to count the total number of 416's and 415's in the following xml ... Is there is anyway to use predicates in count function  to acheive this.
   
any help and pointers ...

<rep>
  <appl>
       <apps>
           <sysid>416</sysid>		
        </apps>
        <apps>
           <sysid>415</sysid>		
        </apps>        
        <apps>
           <sysid>415</sysid>		
        </apps>        
        <apps>
           <sysid>416</sysid>		
        </apps>        
        <apps>
           <sysid>416</sysid>		
        </apps>        
  </appl>
 </rep>

Thanks ...
-Kumar


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