Merging two documents

file1.xml
<root>
  <section1>
    <elem>
      <name>1</name>
      nested data for elem "1"
    </elem>
    <elem>
      <name>2</name>
      nested data for elem "2"
    </elem>
  </section1>
  <section2>
    <something-else>
      nested data 1
    </something-else>
  </section2>
</root>

I need something like
  for-each file1/root/section1/elem
    copy to output
  for-each file2/root/section1/elem
    copy to output
  for-each file1/section2/something-else
    copy to output
  for-each file2/section2/something-else
    copy to output