<tree id="http://dir.yahoo.com" desc="Everything">
 <tree id="Arts" desc="Arts and Humanities"/>
 <tree id="Business" desc="Business and Economy"/>
 <tree id="Computers_and_Internet" desc="Computers and Internet">
   <tree id="Internet" desc="Internet"/>
   <tree id="WWW" desc="WWW"/>
   <tree id="Software" desc="Software"/>
   <tree id="Games" desc="Games"/>
 </tree>
 <tree id="Education" desc="Education"/>
 <tree id="Entertainment" desc="Entertainment"/>
 <tree id="Science" desc="Science">
   <tree id="Animals" desc="Animals"/>
   <tree id="Astronomy" desc="Astronomy">
     <tree id="Astronomers" desc="Astronomers"/>
     <tree id="Cosmology" desc="Cosmology">
       <tree id="Dark_Matter" desc="Dark Matter"/>
       <tree id="Research" desc="Research"/>
     </tree>
   </tree>
   <tree id="Engineering" desc="Engineering"/>
 </tree>
</tree>

