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Data Modeler 
The Data Modeler is a graphical tool and part of the range of Web Dynpro tools. Using the Data Modeler provides you with efficient support for a number of central development tasks.
· Controller definition
· Declaring a Model to the Component
· Working with View Templates
· Working with the Service Controller
The perspective area that displays the Data Modeler is the Diagram View. The entities of a Web Dynpro application are created using graphical means. A selection list of Data Modeler actions is available from which you select the relevant entity and insert it in the design area of the Data Modeler.
You have created a Project and a corresponding root Web Dynpro Component.
To open the Data
Modeler, choose
Open Data
Modeler from the context menu for the component name in the Web
Dynpro Explorer. To create an application entity, choose the corresponding
Data Modeler action in the tool selection area. Then click on the relevant
area in the Data Modeler editor. The corresponding wizard is then started and
you can make the required entries.
For example, to
define a custom controller, choose
Create Custom Controller and then click on
the area
Custom
Controllers. The definition wizard is started automatically.
