Enhydra Shark - Java Open Source Workflow compliant with WfMC XPDL

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The Enhydra Shark project delivers an Open Source Java workflow server with a difference. It is an extendable and embeddable Java open source workflow engine framework including a standard implementation completely based on WfMC specifications using XPDL (without any proprietary extensions !) as its native workflow process definition format and the WfMC "ToolAgents" API for serverside execution of system activities. Every single component (persistence layer, transaction manager, scripting engines, process repository,...) can be used with its standard implementation or extended/replaced by project specific modules.

http://www.enhydra.org/workflow/
http://www.enhydra.org/workflow/shark/
http://forge.ow2.org/projects/shark/