Hypermedia – Data integrity/Correctness
c. Data integrity/Correctness
The database layer should preserve data integrity and provide traditional secondary storage management and data administration facilities. It should forbid dangling references to objects or attributes and prevent recursive inclusion of composite objects [Schutt & Streitz, 1990]. It should also support either the notion of rules as in extended relational databases or the concept of semantics as in object-oriented databases.