M.H. Scholl, C. Laasch, M. Tresch, and H.-J. Schek. The COCOON core object model. Technical report, ETH Zurich, Dept. of Computer Science, 1991. in preparation. Home/Search Document Not in Database Summary Related Articles Check |
This paper is cited in the following contexts:
A Framework for Schema Evolution by Meta Object Manipulation - Tresch (1991) (15 citations) Self-citation (Tresch) (Correct)
....Since a type may have many instances, such eager conversion of all objects after each schema modification may be to expensive. In contrast, a lazy conversion strategy delays any instance conversion as long as possible. With a slight modification of the formal definitions of the COCOON model in [SLTS91] we can even build this lazy conversion into the model. The state function oe : F (O O) returns for each function object f 2 F , the actual function O O from the database state: oe(f i ) o j ) 8 : v ij , if 9 f i ; o j ; v ij 2 Sigma and v ij 2 ran(f i ) if 6 9 f i ....
M.H. Scholl, C. Laasch, M. Tresch, and H.-J. Schek. The COCOON core object model. Technical report, ETH Zurich, Dept. of Computer Science, 1991. in preparation.
Schema Transformation Processors For Federated Objectbases - Tresch, Scholl (1993) (4 citations) Self-citation (Scholl Tresch) (Correct)
....access control in FOBs using schema extension combined with filtering. A comparison to other related work is made in Section 6. Finally, Section 7 concludes with an outlook on open issues. 2 AN OBJECT MODEL AND ALGEBRA We briefly review the key concepts of the object model COCOON and its algebra [14, 12], used throughout this paper. The COCOON object model is an object function model with the basic constituents objects, functions, types, classes, and views: Objects are instances of abstract object types (AOTs) specified by their interface operations. In contrast, Data are instances of concrete ....
....; name; addr ; bought ; priceg : The schema is now closed again. However, the price function was included, which is exactly what we wanted to avoid. The way out from the above dilemma is an enhanced projection operator that allows to redirect function range types. The redirecting projection [12] allows to change the range type of a projected function in the projection list: project [ f: t, e ) with t range(f) Redirection must be limited to supertypes in order to stay within the type checking possibilities of a polymorphic type system. Example 4: The revised attempt to find ....
M.H. Scholl, C. Laasch, C. Rich, M. Tresch, and H.-J. Schek. The COCOON core object model. Technical report, ETH Zurich, Dept. of Computer Science, 1992. in preparation.
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