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.
Thanks for the interesting URLs on workflow discussions.
Corba Ecommerce has very interesting and thorough models of workflows, including UML diagrams and even an XML format for defining state machines. Sorry, this may be old news as I don't have time to follow up the actual threads beyond the first messages.
But if not, anyone designing such a system for Zope *must* study the Corba stuff.
Email me direct if the URLs haven't been published in the discussions and I'll be happy to dig them up (hard to find within www.omg.org). Or, (easier for me), I can email the (large) .pdf files direct.
I also know that WfMC (Workflow Management Coalition, www.wfmc.org) has adopted many of OMG's workflow concepts in the past. I am not sure if what you are referring to is recent new development by OMG.
For a diagram of WfMC's workflow reference model see the diagrams at: