Chapter 4 Building Conceptual Data Models

Using a data item as a specifying attribute

You can use a data item defined in the model as an specifying attribute.

Note   Allow Reuse
If the model option Allow Reuse is not selected, you can not create an specifying attribute by reusing an existing data item. In this case the Add Data Item tool is not available.

Steps To use a data item as a specifying attribute:

  1. Double-click an inheritance symbol to display the inheritance property sheet.
  2. Click the Generation tab to display the corresponding page.
  3. Select the Generate Parent check box.
  4. Clear the Generate Children check box.
  5. Click the Add Data items tool.

    A Selection box appears listing all of the available data items.
  6. Select a data item.
  7. Click OK.

    The selected data item is added to the list of specifying attributes for the inheritance.
  8. Click OK.

Note   Using the Generate option
The option Generate Children generates a table for each child in the inheritance. If you do not select Generate Children, you can control the generation of child tables using the option Generate in the property sheet of each child entity.

 

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