Hello BrownR,
You can solve this by doing a translate on the two value so that both of them are in the same case and them compare them. Something like this will be part of your xpath.
translate(Customer/LastName,'QWERTYUIOPLKJHGFDSAZXCVBNM','qwertyuioplkjhgfdsazxcvbnm') = translate(\"{1}\", 'QWERTYUIOPLKJHGFDSAZXCVBNM','qwertyuioplkjhgfdsazxcvbnm')
Shanthi
InfoPathDev India
Shanthi Reddy