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<list>
  <module name="all">
    <moduleref name="a">
...
  </module>

</list>

<list>
  <module name="all">
    <module name="a">
...
    <moduleref name="c">
  </module>
</list>

use XML::DOM;

my $xml_file = “./sample.xml”; 
...
    }
  }
}