工作流方面的知识早在两年前关注过，原本只是规范文档的，现在已有功能实现了。
看下面的资源：
工作流引擎实现：[shark]
http://forge.objectweb.org/projects/shark/
工作流图形编辑工具：[jawe]
http://forge.objectweb.org/projects/jawe/
Enhydra Shark is a workflow server with a difference. Shark is
completely based on standards from WfMC and OMG using XPDL as its
native workflow definition language. The Shark framework can be
configured to support different environments.
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Enhydra
JaWE is a graphical Java Workflow Editor according to WfMC
specifications supporting XPDL as its native file format. JaWE can be
used to edit workflow definitions for Enhydra Shark or every other XPDL
conformant Workflow server.