Are there any difference between BPEL, WSBPEL and BPEL4WS?
You can consider them as synonyms. BPEL4WS was the name of the specification in version 1.0 and 1.1, when it was a proprietary document of MSFT, IBM et al.
After the specification was submitted to OASIS for becoming a standard, it was renamed WS-BPEL. The OASIS technical committee (of which we are part :-) recently approved version 2.0.
Of the above, we have comprehensive coverage of BPEL4WS 1.1 and partial coverage of WS-BPEL 2.0.
BPEL is the acronym normally used when you want to refer to the language itself, without regard of version or status as a standard.
