repeating elements

How can i copy everything between the <cell> tag more than once?

<?xml version="1.0"?>
<row>
  <cell>
    <data atr="1">9</data>
    <namedcell name="A"/>
    <data atr="2">9</data>
    <namedcell name="B"/>
  </cell>
</row>

Should become:

<?xml version="1.0"?>
<row>
  <cell>
    <data atr="1">9</data>
    <namedcell name="A"/>
    <data atr="2">9</data>
    <namedcell name="B"/>
    <data atr="1">9</data>
    <namedcell name="A"/>
    <data atr="2">9</data>
    <namedcell name="B"/>
  </cell>
</row>



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