[Plugin: FeedWordPress] Only get 1 result with Xpath

How can I make the Xpath version that works with FWP only grab the first element?

I am using it to grab a youtube link, and youTube has two <link> elements, but they are separated by a rel.

I have tried to do link[1]/@href and all kinds of variations to it but no luck.

http://wordpress.org/extend/plugins/feedwordpress/