Restfulie restfulie-ruby

I need to be able to create feeds with nested compostion of tags:

Portion of feed with nested composition:

    <articles:body type="html">body</articles:body>
        <articles:creation>
        <articles:author>John Dee</articles:author>
        <articles:creation_date>2010-05-03T16:29:26-03:00</articles:creation_date>
    </articles:creation>

Full feed sample:

<feed xmlns="http://www.w3.org/2005/Atom" xmlns:articles="http://localhost:3000/articles">
    <id>http://localhost:3000/articles</id>
    <title>Articles Feed</title>
    <updated>2010-05-03T16:29:26-03:00</updated>
    <entry>
        <title>article title</title>
        <id>http://localhost:3000/articles/article_title</id>
        <updated>2010-05-03T16:29:26-03:00</updated>
        <link href="http://localhost:3000/articles/article_title" rel="self"/>
        <articles:body type="html">body</articles:body>
        <articles:creation>
        <articleauthor>John Dee</articles:author>
            <articles:creation_date>2010-05-03T16:29:26-03:00</articles:creation_date>
        </articles:creation>
    </entry>
</feed>