工作流演进变化中迁移策略的自动生成

工作流演进变化中一个重要问题就是如何实现工作流实例的迁移问题。提出了一种支持演进变化的工作流过程模型及相关的实例模型和修改模型，并在此基础上提出了一种新的迁移策略。该策略中每个节点的迁移规则根据工作流模型修改点与实例执行路径的关系确定相应的迁移动作。此外，还提出了一个根据工作流模型修改点的偏序关系自动生成各节点迁移规则的算法。

Automatic building of transfer policy in workflow evolution changes

How to transfer a workflow instance from the old workflow specification to the new workflow specification is the most challenging issue in evolution of a workflow model. An workflow process model was proposed with relative workflow instance model and change model. A new transferring policy was also presented. Each transfer statement of task node in old specification confirm appropriate action according to the relations between specification change points and excute path of workflow instance, In addition, an algorithm of automatically building transfer rule of each task node according to the partial ordering of change node was put forward.