So update!
Down loaded Notepad++ and was able to look at the files and work out which line was which.
With the help of Gil I was able to delete the offending syntax and now the file works.
The was some unusual hangover in the models but that was fixed with an update.
I still have no idea how it all happened. Nor do I even understand what I was reading and correcting, BUT I know have my models all working correctly again, and a small xml file sitting on my desktop that I know is good, if this happens again!
Thanks to all for there input!
