Sort of the idea, except I realize that I should be using SXPATH instead of xml/path
This seems to do something.

Now to figure out how to filter on attributes.
Now we're cookin' with gas!
Subdir
Got with

        curl http://www.gyford.com/misc/doonesburyrss.php
W00t.  This downloads the last few image URLs and opens them.
Example of modifying XML in place
Idle refactoring
Thinking about using "match" to destructure the XML