$f{foo}=[{a=>5,b=>7},{a=>1,b=>2}];
print DumperXML(\%f);

##</code><code>##

<foo> 
  <element>
    <a>5</a>
    <b>7</b>
  </element>
  <element>
    <a>1</a>
    <b>2</b>
  </element>
</foo>