The first level: Graphelement is easy to understand because the objects of each drag are elements of a graph element when the drawing process is defined. The graphelement has two properties: 1) ProcessDefine indicates which process definition of the current element is 2) Events represents can be received What Event
Second level: node; processdefinition; transition, all inherited from graphelement1) ProcessDefinition means process definition, it has the following properties: ID, name, version, nodes, startstatenodes indicate all Node, StartState to start the process when the flow is found Nodes, this is the same as the definition in AgileFlow. 2) Transition indicates the transfer, it has two properties: fromnode, tonode3) Node indicates node, it has two properties: Leaving Transitions; ariving transitions
Level 3: A variety of different NODEs, they are all inherited from nodedecision; endstate; fork; join; merge; milestone; interleavend; interleavestart; processState; State These are meaningless, and XPDL is similar.
