composite unit graph 复合单位过程线
BPMN is graph based, where as BPEL has a composite structure without transitions that corresponds to a tree.
BPMN是基于图形的，而BPEL是一个没有变迁的树形组合结构。
As a mathematic branch studying the graphical composite relation and fabric, the graph theory can be expediently used in solving graphical problems with computer algorithm.
图论是研究图的组合关系及结构的一个数学分支，可以方便地实现图形同计算机算法的结合。
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