reading from multiple XML files

Hi All

I have 2 XML Files

XML1
====
<list>
<el1> text1</el1>
<el2>
   <sub1> xx </sub1>
   <sub2> yy </sub2>
</el2>
<el3> text3> </el3>
</list>

XML2
====
<list>
<el1> one </el1>
<ely> yyy </ely>
<el2>
   <sub1> xx_111 </sub1>
   <sub2> yy_222 </sub2>
</el2>
<elx> new element </elx>
</list>

I want to combine the above two files into a 3rd file

XML3
====
<list>
<el1> text1</el1>
<el1> one </el1>
<el2>
   <sub1> xx </sub1>
   <sub2> yy </sub2>
</el2>
<el2>
   <sub1> xx_111 </sub1>
   <sub2> yy_222 </sub2>
</el2>
<el3> text3> </el3>
<ely> yyy </ely>
<elx> new element </elx>
</list>

Please note that order is important. It is like File XML1 is master so copy 
the element from XML1 and
then similar element from XML2 are appeded. Once all elements of XML1 are 
completed then remaining
elements from XML2 are copied.

Thanks for any help.
Kumar

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