Question: how to pass bpel variable in xslt?
Answer:  Declare a variable that is of the abovementioned dataType [see XML above.]
 Populate the variable with the contents of the BPEL variable you wish to pass into the XSLT.
 Invoke processXSLT() with the XSL File, source variable, and the parameters variable.
 Access the parameter contents within the XSLT.