Modeling & Scheduling of Data Flows in Workflow of Activity Instances

According to the characteristics of data flow model,a data flow meta-model is defined and a graphical two-step modeling method of data flows is presented,which can exactly describe interactions among fine-grained interface data between activities.Through extension of the traditional workflow engine,scheduling policy of data flows in workflow of activity instances is presented,and the key scheduling algorithms are realized according to the validation rule of data consistency,such as data preparation and data submission.The concept of virtual activity instances resolves the scheduling problem of versions of activity instance data.At last,the method is validated by the example.