Understanding the Model Layer - Oracle ADF 11gR2 Development Beginner's Guide - page 65

Have a go hero - drag-and-drop components
So now, let us try to drag-and-drop the EmpEO and DeptEO enity objects and the newly
created associaion together onto the EmployeeDirectoryDiagram diagram created
in Chapter 2 , Geing Started with ADF .
About the view object
In the previous chapter, we created the EmpVO.xml file, which is the view object used to
collect, retrieve, and manipulate data from the data source. EmpVO will have a reference
to EmpEO as the enity object that will be used to refer to the EMP table.
The use of having a view object is as follows:
To fetch informaion from the data source using SQL query
To sort, filter, project, and join data
To isolate the view data from other parts of the applicaion