Using Prebuilt Declarative Validation Rules
The easiest way to create and manage validation rules is through the declarative validation framework. Oracle ADF is shipped with a number of built-in declarative validation rules that will satisfy many of your business needs. You implement these rules through the entity object editor and they are stored in the entity object’s XML file.
You can implement these rules either on the entity object itself, or on its attributes. The next few slides show how to use the built-in declarative validation rules.