finding postion from value of attribute

Hi,

I have the following xml input and would like to identify the position 
of the <answer/> element with the 'correct' attribute within the 
<question/> context and output it as as an integer ( in this case 3).
<question>
   <answer/>
   <answer/>
   <answer eval="correct">
   <answer/>
</question>

Any suggestions much appreciated

David Elsmore



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