[Jerry] This may be the link you were thinking of: http://www.omg.org/technology/documents/formal/corba_business_specifications _av2.htm with the Corba Workflow Specification available as a .PDF. [AlbertL] Yes. The Task and Session spec there is also very relevant. The Workflow Spec is based directly on the work done by the Workflow Management Coalition mentioned by Albert Boulanger. I haven't checked the original (1993) from the coalition but the Corba document is more modern (1.20, April 2000) with UML diagrams as well as IDL and diagrams similar to those on Albert Boulanger's web page. However I am also referring to the "Corba Electronic Commerce Domain Specifications" 1.0 which I don't think is listed among omg formal published documents yet. This extends to concepts such as "Community", "Membership", "Collaboration" and "Voting" which I think are highly relevant to PTK. Plus detailed elaboration of state machine triggers and transitions etc and more specifically ecommerce related stuff on negotiations and contractual obligations. The related "Negotiation Facility" is listed at: http://www.omg.org/technology/documents/recent/corba_e-commerce.htm and also worth a look. But the one I particularly recommend isn't even listed on their home page: http://www.omg.org/homepages/ecdtf/index.htm Had a good look now, but I'm afraid I've lost the URL for it. Can email a copy (1MB). I was also referring to the "OSM Digital Product Architecture", 20 November 2000, which has the XML state machines spec. http://home.osm.net/supporting/index.html http://home.osm.net/supporting/DPA.0011B.pdf Strongly recommend close study of all of these. (A lot has happened since 1993 ;-)