The documentation talks about how to fetch the next 50 records when downloading a table that has more than 50 records. "Use the links in the response (rel="next") to retrieve additioyeahnal pages of list members."
Here are three lines from my returned xml that contains the first 50 records. I'm a little confused because the first line already has "rel=next". However, resubmitting this xml simply returns the exact same list.
Okay, the fog has lifted and so has my confusion. My problem was that I didn't understand how to use link node and I was heading in a completely wrong direction with it. All is right with the world now.