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open FH, ">", "webcams.xml";
print FH XMLout($combined, KeyAttr => {AttrIndent => 1,
                            xmldecl => '<?xml version="1.0" encoding="
+UTF-8"?>',});
close FH;

<opt class="java.beans.XMLDecoder" version="1.6.0-oem">
  <object class="java.util.HashSet">
...
    <void method="add" string="football" />
  </object>
</opt>

<java version="1.6.0_02" class="java.beans.XMLDecoder"> 
 <object class="java.util.HashSet"> 
...
  </void> 
 </object>
</java>