I added a link on the wiki page https://forge.gridforum.org/sf/wiki/do/viewPage/projects.ogsa-wg/wiki/OGSAWo... yesterday for an article that seems germane "Grid Service Orchestration Using the Business Process Execution Language (BPEL)". The link underneath that title is to the official repository for the PDF, which is only available to subscribers to the Springer Digital Library. If you're not such a subscriber, the author has placed a copy here http://www.cs.ucl.ac.uk/staff/w.emmerich/publications/JoGC/Workflow/bpel.pdf for us to look at. Best, chris