第3章 Decision Model and Notation (DMN)


Decision Model and Notation (DMN) is a standard established by the Object Management Group (OMG) for describing and modeling operational decisions. DMN defines an XML schema that enables DMN models to be shared between DMN-compliant platforms and across organizations so that business analysts and business rules developers can collaborate in designing and implementing DMN decision services. The DMN standard is similar to and can be used together with the Business Process Model and Notation (BPMN) standard for designing and modeling business processes.

For more information about the background and applications of DMN, see the OMG Decision Model and Notation specification.

3.1. Creating the traffic violations DMN decision requirements diagram (DRD)

A decision requirements diagram (DRD) is a visual representation of your DMN model. Use the DMN designer in Business Central to design the DRD for the traffic violations project and to define the decision logic of the DRD components.

図3.1 DRD for the Traffic Violations example

dmn traffic violations drd

Prerequisites

  • You have created the traffic violations project in Business Central.

Procedure

  1. On the traffic-violation project’s home page, click Add Asset.
  2. On the Add Asset page, click DMN. The Create new DMN window is opened.

    1. In the Create new DMN window, enter Traffic Violation in the DMN name field.
    2. From the Package list, select com.myspace.traffic_violation.
    3. Click Ok. The DMN asset in the DMN designer is opened.
  3. In the DMN designer canvas, drag two DMN Input Data input nodes on to the canvas.

    図3.2 DMN Input Data nodes

    library objects
  4. In the upper-right corner, click the Properties diagram properties icon.
  5. Double-click each input node, and in the Name field, rename one to Driver and the other to Violation.
  6. Drag a DMN Decision decision node on to the canvas.
  7. Double-click the decision node and rename it to Fine.
  8. Click the Violation input node, select the Create DMN Information Requirement icon and click the Fine decision node to link the two nodes.

    図3.3 Create DMN Information Requirement icon

    info requirement
  9. Drag a DMN Decision decision node on to the canvas.
  10. Double-click the decision node and rename it to Should the driver be suspended?.
  11. Click the Driver input node, select the Create DMN Information Requirement icon and click the Should the driver be suspended? decision node to link the two nodes.
  12. Click the Fine decision node, select the Create DMN Information Requirement icon, and select the Should the driver be suspended? decision node.
  13. Click Save.

    注記

    As you periodically save a DRD, the DMN designer performs a static validation of the DMN model and might produce error messages until the model is defined completely. After you finish defining the DMN model completely, if any errors remain, troubleshoot the specified problems accordingly.

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