WS-BPEL 2.0 was approved as an OASIS Standard in April 2007. It defines a model and a grammar for describing the behavior of a business process based on interactions between the process and its partners. The interaction with each partner occurs through Web services interfaces. The WS-BPEL process defines how multiple service interactions with these partners are coordinated to achieve a business goal, as well as the state and the logic necessary for this coordination.
Read more: http://bpel.xml.org/about-bpel
You can Find the BPEL specification at http://docs.oasis-open.org/wsbpel/2.0/wsbpel-v2.0.html Read more: http://bpel.xml.org/about-bpel
In one of my Next Post, I am going to describe some key concepts in BPEL.