Indefinite Information with Certainty Factors for Object-Oriented Databases

This paper presents an approach to integrate the concepts of indefinite information with certainty factor in an object-oriented framework. In this work, the concept of traditional indefinite information is extended to include certainty factors so that indefiniteness can be measured. Indefinite information with certainty factors is classified into two categories: certainty factors of association and certainty factors of object. Each of these categories is applied to each type of object: Scala value, rule, and operation, etc. Instances wi th indefinite information with certainty factors including definite object is shown to be stored in G-relation. Various types of answers generated when query is issued are defined. Several rules for the computation of certainty factors based on Fuzzy Set theory are suggested to compute resultant certainty factor for the answer in query processing.