Extract XML information using XPathDocument ISSUE !

Question

Hi there i try to extract specefic data from xml feed from youtube.

XML link: http://gdata.youtube.com/feeds/api/videos/WFPnl8aEPgo?alt=rss

I'v been able to extract info like:

using this query string:

Dim Title As String = videoInfoNavigator.SelectSingleNode("/item[1]/title").Value

however i'd like to get info of this:

What would be my query string ?