You might want to point out that this is in succession to Which is Best ? XML or Textpad, in which thread you also mention the Utils::XMLUtils package.

You also mention there that the output you want is basically:

<SigData>
    <KVPair>
        <Key>...</Key>
        <Value>..</Value>
    </KVPair>
</SigData>
<SigData>
    <KVPair>
        <Key>....</Key>
        <Value>..</Value>
    </KVPair>
</SigData>
[download]

so I wonder, why aren't you simply using print statements to print out the XML you want?