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use strict;
use warnings;
...
$doc->documentElement->appendChild($doc->createElementNS($ns, 'q:two')
+);
$doc->documentElement->appendChild($doc->createElementNS($ns, 'q:three
+'));
warn $doc->toString(1);

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<?xml version="1.0"?>
<q:one xmlns:q="http://www.example.com">
  <q:two xmlns:q="http://www.example.com"/>
  <q:three xmlns:q="http://www.example.com"/>
</q:one>