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

##</code><code>##

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

##</code><code>##

<java version="1.6.0_02" class="java.beans.XMLDecoder"> 
 <object class="java.util.HashSet"> 
  <void method="add">
   <string>baseball</string>
  </void>
  <void method="add">
   <string>football</string>
  </void> 
 </object>
</java>