Adding a custom namespace prefix and uri with rome

Hi,

 Can someone help me add a custom namespace prefix and uri with rome? I haven't seen an example that did this in the tutorials.

Here's the code I would like to produce: 

<rss xmlns:edwardotis="com:edwardotis:www" version="2.0">

  <channel>

    <title>included</title>

    <link>http://edwardotis.com/link>

    <language>en-us</language>

    <description>my description</description>

    <edwardotis:pageSize>5</ edwardotis:pageSize>

</channel>

</rss>

(Similar to this tutorial on extending RSS)

http://www.disobey.com/detergent/2002/extendingrss2/

Thanks!

Ed