datetime

<?xml version="1.0" encoding="UTF-8"?>
<listing>
  <created-at type="datetime">2011-03-09T17:28:40Z</created-at>
  <description>Awesome thinger for sale</description>
  <id type="integer">2</id>
  <lat type="float">35.0</lat>
  <lng type="float">40.0</lng>
  <phone-number>+15558675309</phone-number>
  <photo-url>http://example.com/photo.jpg</photo-url>
  <price type="integer">10</price>
  <status nil="true" />
  <thumbnail-url>http://example.com/thumbnail.jpg</thumbnail-url>
  <updated-at type="datetime">2011-03-09T17:31:42Z</updated-at>
</listing>