query a XML with unknown elements and attributes

Question

I want to query a xml file.

I read this http://weblogs.asp.net/scottgu/archive/2007/08/07/using-linq-to-xml-and-how-to-build-a-custom-rss-feed-reader-with-it.aspx ,

But in my case i don't know the names of elements and attributes of the file.

So i could i do ?

Thanks