Workflow Patterns are enumerated at http://www.workflowpatterns.com. OpenWFE's process definition language has been 'forged' to face the challenges dictated by each of these patterns.

Workflow patterns are listed here with possible OpenWFE solutions. You shouldn't skip this chapter, it will teach you a lot about OpenWFE and what you can do with it. Its expressions are shown here in full light.

The explanations here may seem spartan. More info will be added, but it's perhaps better to browse this 'pattern' chapter in parallel (concurrence) with the workflow patterns website.

    <sequence>
       <participant ref="task-a" />
       <participant ref="task-b" />
    </sequence>