Objects and Inheritance

Deductive and Object-Oriented Databases

Volume 1013 of the series Lecture Notes in Computer Science pp 229-246

Date:

Structured objects: Modeling and reasoning

  • Diego CalvaneseAffiliated withDipartimento di Informatica e Sistemistica, Università di Roma “La Sapienza”
  • , Giuseppe De GiacomoAffiliated withDipartimento di Informatica e Sistemistica, Università di Roma “La Sapienza”
  • , Maurizio LenzeriniAffiliated withDipartimento di Informatica e Sistemistica, Università di Roma “La Sapienza”

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Abstract

One distinctive characteristic of object-oriented data models over traditional database systems is that they provide more expressive power in schema definition. Nevertheless, the defining power of object-oriented models is still somewhat limited, mainly because it is commonly accepted that part of the semantics of the application can be represented within methods. The research work reported in this paper explores the possibility of enhancing the power of object-oriented data models in schema definition, thus offering more possibilities to reason about the intension of the database and better supporting data management. We demonstrate our approach by presenting a new data model, called CVL, that extends the usual object-oriented data models with several aspects, including view definition, recursive structure modeling, navigation of the schema through forward and backward traversal of links (attributes and relations), subsetting of attributes, and cardinality ratio constraints on links. CVL is equipped with sound, complete, and terminating inference procedures, that allow various forms of reasoning to be carried out on the intensional level of the database.