| | 3 | The data model must meet the following requirement: |
| | 4 | |
| | 5 | Separation of data model and content. Data model will be called TBox (Terminological Box) and the content ABox (Assertion Box) in consistent with Description Logic. |
| | 6 | |
| | 7 | The structure of data based on graph requires a similar features for the TBox as for the ABox. Therefore both collection of object will be modeled with the same class diagram. The difference between both sets can be recognized by the attribute type (TBox/ABox). This model does not implies that both sets will be saved in the same database's table. |
| | 8 | |
| | 9 | There exist only one relation, which connect the TBox with the ABox. It is “is type of”, which indicates that definition or concept that is instanced by the concrete entity. |
| | 10 | |
| | 11 | A special case is the object View. The more typical use of View is the representation of an element in a determinate language. Every element could be represented by different languages, it includes Concepts and its instances, therefore it has an especial type called just view. |
| | 12 | |
