excluding descendants (and all of their descendants as well)

How does one find all text elements that are descendants of the first para 
element but exclude any text element that is a descendant of the second system 
element?  

<techinfo>
  <system>
    <descinfo>
      <para-seq>
        <para>
          <text>The quick brown fox jumped over the lazy systems 
engineer.</text>
          <text>Hello world.</text>
          <style>
            <text>In the matter of Jardyce v. Jardyce:</text>
          </style>
          <system>
             <descinfo>
                 <para-seq>
                     <para>
                          <text>Blah, blah, blah...</text>
                           <text>more gibberish.</text>
                           <style>
                               <text>Nasty, Brutish, and Short Attorneys at 
Law</text>
                           </style>
                        </para>
                      </para-seq>
                  </descinfo>
               </system>
            </para>
         </para-seq>
      </descinfo>
   </system>
</techinfo>

Thanks very much.



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