BPEL4WS流程本身基本上就是一个流程图，类似于用来表达算法的流程图。
The BPEL4WS process itself is basically a flow-chart like expression of an algorithm.
该算法基于流图理论的基本原理和简单的集合运算，概念明确，易于掌握；
The algorithm is based on the principle of flow graph theory and set theory.
该算法基于流图理论的基本原理和简单的集合运算，概念明确，易于掌握；
The algorithm is based on the principle of flow graph theory and set theory.
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