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count is a xpath standard function, countNodes is an Oracle BPEL extension function, they both do the same, but Oracle now recommends using count...
There's a note in this document http://docs.oracle.com/cd/E23943_01/dev.1111/e10224/bp_appx_functs.htm#CJACABGA
While the countNodes function is still available for use, Oracle recommends that you use version 1.0 of the XPath count() function to return the size of the elements as an integer.