[xsl] Correlate elements in 2 different trees?

["Leslie Young" <xlr8sx@xxxxxxxxxxx>]

I am trying to figure out how to process 2 trees in a XML file using xslt 
1.0. First I need to sort the elements alphabetically. Then correlate the 
element and its attributes found in both trees, then output the result to a 
html table.
Any advise how to do this?  Thanks in advance!

Input xml:
<Tree1>
 <element3>
   <child3 xxx yyy>

 <element2>
   <child2 xxx yyy>

 <element1>
   <child1 xxx yyy>
</dataset1>

<Tree2>
 <element1>
   <child1 aaa bbb>

 <element3>
   <child3 bbb>

 <element2>
   <child2 aaa bbb>
</dateset2>


output to a html table:
 <element1>  <child1 xxx yyy aaa bbb>
 <element2>  <child2 xxx yyy aaa bbb>
 <element3>  <child3 xxx yyy       bbb>

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