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Workflow models have been used and refined for years to execute processes within organizations. To deal with collaborative processes (Choreographies) these internal workflow models have to be aligned with the external behavior advertised through Web service interfaces. However, traditional Workflow Management Systems (WfMS) do not offer this functionality. Simply sharing and merging process models is often not possible, because workflow management lacks a widely accepted standard theory for workflow models. Multiple research and standardization efforts to integrate different workflow theories have been proposed over the years.
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