As required in section 9.2.4 of the BPEL spec, core XPath 1.0 and BPWS function 
libraries are available in expressions. 

The XPath 1.0 recommendation describes the core functions in chapter 4. The 
function library is quite minimalist, but you can achieve your purpose with:
substring-before(
  |   bpws:getVariableData('inputVariable', 'payload1', '/payload1/input1') +
  |   bpws:getVariableData('inputVariable', 'payload1', '/payload1/input2'),
  |   ".")
The output should be "246".

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