在流程模型的某些部分中，我们希望能描述流程中的信息是如何通过事件(这些事件是在活动间流动的)被接收到的，为此我们将使用业务项和数据流连接。
In process models, where we want to describe how information received through events flows between the activities in a process, we use business items and data-flow connections.
数据流程图描述了逻辑系统。
系统的数据流程图描述了作者层与读者层两个工作层面之间相互切换以及它们同系统之间相互通讯的关系。
The switching between author and reader levels and their intercommunication with the system may be described by a data flow graph.
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