So I had a tab who's inner value was a text of a number (1,2,3,...) and I was able to retrieve information using the following xpath statement

instance('INSTANCE1')/complexs/complex[.=instance('INSTANCE2')/school_results/@complexID]/@name

This worked fine until I changed it to a GUID and no longer a number. Now it fails is there something I have to change in the query to make it compatable with a string?

Thanks