NullPointerException

I did go through the xpath tutorial and I understand that well now.  but, that does not help solve my problem.  What I am trying to do is to find a way to do subscript and superscript of some text data.  The node search code I mailed earlier does contain the proper &lt and &gt followed by a semicolon.   ( the email system I am using is converting &lt to < and &gt to  :( ).  I am soooo lost and need your help very badly.  

The string "<sub>" is not an attribute.  It is a value of an element.  OK! just forget what I have done.  Pls tell me a way to do a subscript/superscript!!!!

THANK YOU

Norm



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