XML: Add additional lines into root element

I'm trying to make following structure of XML:

<?xml version="1.0" encoding="utf-8"?>
<source>
  <publisher>Example Job Site</publisher>
  <publisherurl>http://www.examplejobsite.com</publisherurl>
  <lastBuildDate>Fri, 10 Dec 2008 22:49:39 GMT</lastBuildDate>

  <job>[...]</job>
  [...]
  <job>[...]</job>
</source>

Question is, how can I put additional lines into root element (source)?

Thanks.