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The COCOON object model

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COCOON_Object_Model_1992.pdf
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1992

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Laasch, Christian
Rich, Christian
Schek, Hans-Jörg
Tresch, Markus

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Zusammenfassung

The COCOON model was intended to extend the concepts of relational database management systems (DBMSs) beyond nested relational to object-oriented ones. Key characteristics of COCOON and its database language COOL 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; update operations that keep model-inherent integrity constraints consistent; 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). This report gives a comprehensive introduction to the COCOON model and its language COOL as well as a formal de nition. Our formalization uses denotational semantics, a popular technique in programming languages. We found that standard set-theoretic formalizations of data and object models were not equally well-suited to express update semantics. This, however, is essential for object-oriented as opposed to value-based languages. This can also be taken as an indication for the convergence of database languages to generell programming languages. Along these same lines, we emphasized static-type checking of COOL.

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ISO 690SCHOLL, Marc H., Christian LAASCH, Christian RICH, Hans-Jörg SCHEK, Markus TRESCH, 1992. The COCOON object model
BibTex
@techreport{Scholl1992COCOO-6291,
  year={1992},
  title={The COCOON object model},
  author={Scholl, Marc H. and Laasch, Christian and Rich, Christian and Schek, Hans-Jörg and Tresch, Markus},
  note={Prepr. of: Technical Report No. 192, Dept. of Computer Science, ETH Zürich, Dec. 1992}
}
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Prepr. of: Technical Report No. 192, Dept. of Computer Science, ETH Zürich, Dec. 1992
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