Workflow system is one of the most popular applications for enterprise business processing and collaborating. With stable workflow engineering and mature design tool, workflow systems can be designed and maintained flexibly and economically. During the development of workflow systems, workflow specification is the most primary design task. Workflow pattern is a main technique for modeling workflow control flow. Based on real projects implement, two new workflow patterns, D&B (
y-pass patterns), are proposed. The semantic of D&B are not covered by other known workflow patterns. D&B patterns enrich the workflow model method and make workflow specifying in a more natural way.
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