Chapter 4 Building Conceptual Data Models

Attaching a data item to a domain

If you attach a data item to a domain, the domain supplies the data type and related data characteristics.

The domain applies a standard data type to the data item. It can also apply length, decimal precision, and check parameters.

To attach a data item to a domain:

1. Select Model→Data Items to display the list of data items.
2. Click the data item to define.
   
   An arrow appears at the beginning of the line.
3. Click the Properties tool.
   
   or
   
   Double-click the arrow at the beginning of the line.
   
   The data item property sheet opens to the General page.
   
   
   
      Opening property sheets at last accessed page
   You can choose to open property sheets at the last accessed page by selecting Tools→General Options→Dialog, and selecting the option Keep Last Tab in the Property Sheets groupbox.
   
   
4. Select a domain from the Domain dropdown listbox at the bottom of the dialog box and click OK.
   
   or
   
   Click the Ellipsis button at the end of the Domain dropdown listbox.
   
   Select a domain from the list that appears and click OK.
   
   You return to the list of data items. In the Data Type column, the data type for the domain replaces the data type previously defined for the data item.
5. Click OK.

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