Meanwhile web-services are starting to be established through out the business
world, but web-services only offer stateless operation calls. Since
workflow management systems are widely accepted to execute long-term
(stateful) business processes within companies, the next step of great interest
is to make stateful cooperative processes available through the web, so that
two or more partners can collaborate in a long-term business process. BPEL is
a joint attempt of Microsoft and IBM to establish a standard to make such
cooperative processes available through the web. We attempt to...