The development of the Internet in recent years has made it possible and useful to access
many different information systems anywhere in the world to obtain information. While there …

Data integration is the problem of combining data residing at different sources, and
providing the user with a unified view of these data. The problem of designing data …

Disjunctive Logic Programming (DLP) is an advanced formalism for knowledge
representation and reasoning, which is very expressive in a precise mathematical sense: it …

We address the problem of minimal-change integrity maintenance in the context of integrity
constraints in relational databases. We assume that integrity-restoration actions are limited …

Dependency theory is almost as old as relational databases themselves, and has
traditionally been used to improve the quality of schema, among other things. Recently there …

The Semantic Web envisions a World Wide Web in which data is described with rich
semantics and applications can pose complex queries. To this point, researchers have …

In databases with integrity constraints, data may not satisfy the constraints. In this paper, we
address the problem of obtaining consistent answers in such a setting, when key and …

Although integrity constraints have long been used to maintain data consistency, there are
situations in which they may not be enforced or satisfied. In this paper, we present ConQuer …

MystiQ is a system that uses probabilistic query semantics [3] to find answers in large
numbers of data sources of less than perfect quality. There are many reasons why the data …

Repairing a database means bringing the database in accordance with a given set of
integrity constraints by applying some minimal change. If a database can be repaired in …