Thus the project is in full control of what is modeled in the repository. It is the schema for defining meta- models. Some examples of meta-models are OO model, ER model, UML model and DFD model.
User models are instances of meta-models.
The accompanying example shows a meta-model for an Object Model and Relational Database System. The end products of a modeling effort are user models. The following example shows part of an Object Model and Relational Model for a banking application.