On the Theory of Types by Quine W. V. O

By Quine W. V. O

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To support this extended model the list of parent objects must be associated with each object. For example, given a Semantic Extensions paragraph P contained in a section S, which is in turn, contained in a document D, that paragraph belongs to the composite object S, which is its parent object and is also indirectly part of the composite object D, by means of S. The concept of composite object, as well as being supported by ORION, is also supported in certain programming languages such as Loops (Stefik and Bobrow, 1984).

Typically, it is used in systems where classes also have an extensional function. 25 26 Chapter 2 (2) Object-Oriented Data Models Persistence is an orthogonal characteristic. The creation of an instance does not have the effect of inserting the instance in the database. An instance created during the execution of a program is deleted at the end of the program, unless it is made persistent. One mechanism for making an instance persistent is to associate a name-user to the instance, or to insert the instance in a persistent collection of objects.

Increasing the semantic complexity of the data model has a number of repercussions on architecture (Bancilhon, 1988); therefore the introduction of a large number of semantic modelling constructs significantly increases the complexity of implementation and reduces the system's performance. * If a large number of modelling constructs are available it is difficult for the user to design the database. In fact, it is not always easy for the user to decide which is the most appropriate representation for a given entity within the context of applications.

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