To set permissions for this subject area, click Permissions. See Select Custom display name or Custom description to dynamically display a The Business model list displays the business model for this subject area. To expose the logical keys to other appli

Creating and Maintaining the Presentation Layer 11-5 However, the Administration Tool can automatically synchronize the name of presentation columns with their corresponding logical column names. To take advantage of this feature, ensure that Use Logical Column Name is selected in the Presentation Column dialog. In some cases, if there are many changes to a logical table or even to an entire business model, it is easiest to delete the corresponding presentation table or subject area, and then and drag and drop the updated logical objects to the Presentation layer. For this reason, it is best to wait until the Business Model and Mapping layer is relatively stable before adding customizations in the Presentation layer. Working with Subject Areas In the Presentation layer, subject areas enable you to show different views of a business model to different sets of users. Subject areas have to be populated with contents from a single business model. They cannot span business models. Typically, subject areas are created automatically by dragging and dropping business models from the logical layer. To edit the properties of a subject area: 1. In the Presentation layer, double-click a subject area. The Subject Area dialog is displayed. 2. In the General tab, you can change the name for the subject area. Note that aliases are created automatically whenever presentation objects are renamed, so that any queries using the original name do not break. Also, a subject area cannot have the same name as any of its child presentation tables. For example, you cannot have a subject area called Customer that has a Customer table within it.

3. To set permissions for this subject area, click Permissions. See

Setting Permissions for Presentation Layer Objects for more information.

4. Select Custom display name or Custom description to dynamically display a

custom name or custom description based on a session variable, typically for localization purposes. See Localizing Oracle Business Intelligence in Oracle Fusion Middleware System Administrators Guide for Oracle Business Intelligence Enterprise Edition for more information about localization.

5. The Business model list displays the business model for this subject area.

6. To expose the logical keys to other applications, select the option Export logical

keys . In most situations, this option should be selected. Many client tools differentiate between key and nonkey columns, and the option Export logical keys provides client tools access to the key column metadata. Any join conditions the client tool adds to the query, however, are ignored, because the Oracle BI Server uses the joins defined in the repository. Note: If you are using a tool that issues parameterized SQL queries, such as Microsoft Access, do not select the Export logical keys option. Not exporting logical keys stops the tool from issuing parameterized queries. 11-6 Metadata Repository Builders Guide for Oracle Business Intelligence Enterprise Edition

7. Optionally, you can set an Implicit Fact Column. This column is added to a query

when it contains columns from two or more dimension tables and no measures. The column is not visible in the results. It is used to specify a default join path between dimension tables when there are several possible alternatives or contexts. 8. Optionally, type a description. This description appears in a mouse-over tooltip for the subject area in Oracle BI Answers. 9. In the Presentation Tables tab, you can add, remove, edit, or reorder the presentation tables for this subject area. 10. Use the Aliases tab to specify or delete aliases for this subject area. See Creating Aliases Synonyms for Presentation Layer Objects for more information about aliases.

11. Click OK.