Chapter 4 Building Conceptual Data Models

Creating an inheritance link

You can create an inheritance link graphically in the diagram by dragging and dropping an inheritance link symbol from the child entity to the parent entity using the Inheritance tool.

To create an inheritance link:

1. Click the Inheritance tool in the Palette.
2. Click the child entity, while continuing to hold down the mouse button, drag the cursor to the parent entity. Release the mouse button inside the child entity.
   
   The link is displayed between the two entities and has a half-circle in the middle and an arrowhead that points to the parent entity.
   
3. If you want to create additional child entities for the same link, drag and drop an inheritance link from the half-circle to the additional child entity.
   
   The symbol links all the child entities to the parent.
   
   
   
      Dragging an inheritance link to a different child entity
   You can change the child entity at the end of an inheritance link by clicking the inheritance link and holding down ctrl as you drag one of its attach points to a different entity.
   
   
4. Double-click the new link in the diagram to display the inheritance property sheet.
5. Type an inheritance name and an inheritance code.
   
6. Click OK.

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