Combining two XML files into one

Hello all,

how can I combine two XML files into one assuming that I have the same
structre in both files like this:

(The first file)

<bookshelf>
  <book><title>1st Book</title>
  <book><title>2nd Book</title>
  <book><title>3rd Book</title>
<bookshelf>
 
(The second file)

<bookshelf>
  <book><title>4th Book</title>
  <book><title>5th Book</title>
  <book><title>6th Book</title>
<bookshelf>


I wouild like to have the following file:

<bookshelf>
  <book><title>1st Book</title>
  <book><title>2nd Book</title>
  <book><title>3rd Book</title>
  <book><title>4th Book</title>
  <book><title>5th Book</title>
  <book><title>6th Book</title>
<bookshelf>

Is this possible? If yes, how can I do that? I am using SAXON. 

Kind Regards,
Karl

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