Thanks for the help; I'm fairly new at all this (obviously).
My use of InfoPath may be a little unconventional. I needed a way to easily create XML data for a podcast and RSS feed, and from the little I knew about InfoPath, it seemed like an easy route. I grabbed XML data from another podcast feed and used it as a template to populate InfoPath. iTunes requires tags that are always along the lines of "itunes:author" or something similar. It has worked great for quite a while. However, I need to change the URL for the feed, and iTunes requires the following tag: <itunes:new-feed-url>. Since I had not created any new fields since the original import of the sample data, this is the first time I have run across this problem.
I am fairly new to XML schemas as well, but your help will certainly get me moving in the right direction. Thank you so much!