apply templates which have a child node containing specific text

Given this xml:
<t>
  <res position="1">
     <entrydata columnnumber="0">
        <text>main title</text>
     </entrydata>
     <rol position="1.1">
        <entrydata columnnumber="1">
           <text>some more text here</text>
        </entrydata>
        <prod position="1.1.1">
           <entrydata columnnumber="2">
              <text>text here</text>
           </entrydata>
           <entrydata columnnumber="3">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="4">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="5">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="6">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="7">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="8">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="9">
              <text/>
           </entrydata>
        </prod>
        <prod position="1.1.2">
           <entrydata columnnumber="2">
              <text>text here</text>
           </entrydata>
           <entrydata columnnumber="3">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="4">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="5">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="6">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="7">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="8">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="9">
              <text/>
           </entrydata>
        </prod>
     </rol>
  </res>
  <res position="2">
     <entrydata columnnumber="0">
        <text>some more text here</text>
     </entrydata>
     <rol position="2.1">
        <entrydata columnnumber="1">
           <text>some more text here</text>
        </entrydata>
        <prod position="2.1.1">
           <entrydata columnnumber="2">
              <text>text here</text>
           </entrydata>
           <entrydata columnnumber="3">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="4">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="5">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="6">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="7">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="8">
              <text>more text here</text>
           </entrydata>
           <entrydata columnnumber="9">
              <text/>
           </entrydata>
        </prod>
     </rol>
  </res>
</t>


I would like to select (apply templates) those <res> elements which have 
<text> tag (1 level down from <entrydata columnnumber="0">) containing a 
specific string. I am not sure how to go about selecting 2 children down 
from the res element as a predicate (which would go in the select statement 
of apply-templates).
e.g. I would like to select a <res> element which has a <text> element 
containing "main title" in it. The example above includes this string in one 
of the res tags.
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