The DescendantNodes operator can be called on a sequence of elements and returns a sequence containing the descendant nodes of each element or document.
The DescendantNodes operator has one prototype.
public static IEnumerable<XNode> DescendantNodes<T> ( this IEnumerable<T> source ) where T : XContainer
This version can be called on a sequence of elements or documents and returns a sequence of nodes containing each source element's or document's descendant nodes.
This is different from the XContainer.DescendantNodes method in that this method is called on a sequence of elements or documents, as opposed to a single element or document.
For this example, I will ...