1.Describe the five interfaces of the WfMC Reference Model [8]. Consider which interfaces are relevant for communication from outside systems, and which interfaces are relevant for the communication...

1.Describe the five interfaces of the WfMC Reference Model [8]. Consider which interfaces are relevant for communication from outside systems, and which interfaces are relevant for the communication to outside systems. For system-to-system communication, when would you use Interface 3, and when Interface 4? 2. For the following exercises you will require an XPDL editor and an XPDL workflow engine. We recommend the following: _ XPDL Editor: JaWE (Java Workflow Editor), download from http://jawe.enhydra. org/ _ XPDL Engine: OBE (Open Business Engine), download from http://sourceforge. net/projects/obe Note that OBE can run stand-alone or under a J2EE application server such as JBoss. The following exercises can be run in stand-alone mode, apart from those that require access to Web services.