you have there several RepeaterData root elements. that's not valid repeating section structure.
how did you get it?
have you joined repeaters from all the rows into single variable?
you have to process repeaters item by item.
store the results in collection, query XML on the collection
that's the problem, you cannot query whole collection (ie. over all the returned items), you have to make query on single collection element.
Ah ha! So I had it out of order. It works now! Thank you so much! This was driving me crazy. I really appreciate you working through it with me.