Following is the prerequisite for generating OBAPI data Model

1. OBAPI schema

   This can be any testing schema created using OBAPI installer.

2. Oracle SQL Developer Data Modeler

   Ensure you have installed the Oracle SQL Developer Data model in your local system. Refer further Oracle documentation for download and install instructions.

   http://www.oracle.com/technetwork/developer-tools/datamodeler/downloads/index.html