Copy missing elements

I have the basic structure.

<list>
    <member>
        <lastname>Jones</lastname>
        <firstname>Frank</firstname>
        <email>frank@xxxxxxxxx</email>
    </member>
    <member>
        <lastname>Smith</lastname>
        <firstname>John</firstname>
    </member>
</list>

The second <member> does not have an <email> element. I want to duplicate
the structure, but add an empty <email> element to the new xml document, so
it looks like this:

<list>
    <member>
        <lastname>Jones</lastname>
        <firstname>Frank</firstname>
        <email>frank@xxxxxxxxx</email>
    </member>
    <member>
        <lastname>Smith</lastname>
        <firstname>John</firstname>
        <email></email>
    </member>
</list>

Thank you in advance.

Rick Quatro
Carmen Publishing
585 659-8267
rick@xxxxxxxxxxxxxxx
www.frameexpert.com