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Business Process Execution Language

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In computer science, the Business Process Execution Language (BPEL) is an XML language that can be used to describe business processes. A BPEL program is invoked as a Web service, and it can interact with the external world only by calling Web services. BPEL is designed IBM and Microsoft, based on their respective work on WSFL and XLANG, which are both superceded by BPEL. In April 2003, BPEL was submitted to OASIS to become an open standard.

The BPEL Language

The BPEL language provides constructs for sequences, loops, conditionals, fault handling and concurrent execution of operations, just like most programming languages.

BPEL Engines

Several BPEL engines have been developed, including:

  • BPWS4J is developed by IBM, and is downloadable from the IBM alphaWorks Web site. Just like other alphaWorks software, BPWS4J has the status of emerging technology. IBM has not yet integrated a BPEL engine into one of its production-level product, like WebSphere.
  • Collaxa BPEL Orchestration server is complete BPEL engine running on top of a J2EE application server. The upcoming version 2 will include a visual BPEL designer, based on Eclipse.
  • OpenStorm ChoreoServer is BPEL engine running on top of the .NET platform.
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