xPATH PROBLEM

Dear All,

I am facing a problem in setting the xpath for a simplexmlextractor. My xml file structure is as below.

<Q>
      <question>
                   <ques answer="india" output="screen">
      </question>
      <question>
                   <ques answer="russia" output="plotter">
      </question>
      <question>
                   <ques answer="china" output="printer">
      </question>
</Q>

i want to make proterteis to answer and output. how to set xpath.

<instruction property="answer" xpath="/Q/question/ques/answer" />
<instruction property="output" xpath="/Q/question/ques/output" />


OR

<instruction property="answer" xpath="/Q/question/ques" />



Help required plz.