union elements in multiple xml documents

I'm looking into ways to combine more than one xml documents together. 
For example: I have one xml document:
<stock ticker="csco">
   <last />
   <date />
   <change />
   <open />
   <high />
   <volume />
<stock>

Another xml document:
<stock ticker="csco">
   <highest />
   <lowest />   
   <average-volume />
<stock>

I want to result document has elements from both. Any suggestions anyone?

Thanks a lot.

Don Yao



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