XSLT for conditional sibling nodes

Question

Hi,

I need to write a XSLT to get the value of the nearest dictionary value to a give node. For example, my structure could be as below

<rootnode>
 <rootcontainer>
  <dictionary>
   <key1> value <key1>
  <dictionary>
  <pages>
   <page1>
    <!--xslt goes here-->
   </page1>
   
  </pages>
 </rootcontainer>
 <dictionary>
  <key1>
   independent value
  </key1>
  <key2>
   value 2
  </key2>
 </dictionary>
</rootnode>

I want to create variables $key1 and $key2 inside Page 1. The value of $key1 will be value and the value of key2 will be value 2. In case rootcontainer\dictionary\key1 doesnt exist, the value of $key1 will be independent value. I hope this makes sense. 

 

Thanks in advane for helping me out.