Portal de Periódicos da CAPES

Survey of the COCOON Project

1992; Springer Nature; Linguagem: Inglês

10.1007/978-3-642-77873-5_11

2628-8958

Marc H. Scholl, H.-J. Schek,

Semantic Web and Ontologies

The COCOON project was intended to extend the concepts and the architecture of relational database management systems (DBMSs) beyond nested relational to object-oriented ones. Based upon the nested relational DBMS kernel DASDBS, we have built a prototype implementation of the COCOON model. Key characteristics of COCOON are: generic, set-oriented query and update operators similar to relational algebra and SQL updates, respectively; object-preserving semantics of query operators, which allows for the definition of updatable views; a separation of the two aspects of programming language "classes": type vs. collection; predicative description of collections, similar to "defined concepts" in KL-One-like knowledge representation languages; automatic classification of objects and views (positioning in the class hierarchy); physical clustering of subobjects via the use of nested relations as the internal storage structures; support for the optimization of both, the physical DB design and query transformation, by corresponding optimizers.