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Results 11 - 20
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148
A Data Model for XML Databases
"... Abstract. In the proposed data model for XML databases, an XML element is directly represented as a ground (variable-free) XML expression—a generalization of an XML element by incorporation of variables for representation of implicit information and enhancement of its expressive power—while a collec ..."
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an extensional database), (ii) a set of axioms and relationships (or an intensional database), (iii) a set of integrity constraints, is therefore modeled as an XML declarative description comprising a set of ground XML expressions and XML clauses. Its semantics is a set of ground XML expressions, which
Scalable Model for Extensional and Intensional Descriptions of Unclassified Data
, 2000
"... Knowledge discovery from unlabeled data comprises two main tasks: identification of "natural groups" and analysis of these groups in order to interpret their meaning. These tasks are accomplished by unsupervised and supervised learning, respectively, and correspond to the taxonomy and e ..."
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and explanation phases of the discovery process described by Langley [9]. The efforts of Knowledge Discovery from Databases (KDD) research field has addressed these two processes into two main dimensions: (1) scaling up the learning algorithms to very large databases, and (2) improving the efficiency
DLDB: Extending Relational Databases to Support Semantic Web Queries
- In PSSS
, 2003
"... Abstract: We present DLDB, a knowledge base system that extends a relational database management system with additional capabilities for DAML+OIL inference. We discuss a number of database schemas that can be used to store RDF data and discuss the tradeoffs of each. Then we describe how we extend ou ..."
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Cited by 99 (13 self)
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Abstract: We present DLDB, a knowledge base system that extends a relational database management system with additional capabilities for DAML+OIL inference. We discuss a number of database schemas that can be used to store RDF data and discuss the tradeoffs of each. Then we describe how we extend
Automatic Generation of Trigger Rules for Integrity Enforcement in Relational Databases
"... Abstract. In this paper, we propose a method for integrity enforcement in relational databases with view de nition using the production rule mechanism provided by active database systems. The method generates a set of trigger rules at compile-time. This set of rules can repair at run-time the incons ..."
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Cited by 1 (1 self)
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-time the inconsistency produced by some transactions by executing a simple update over the extensional database. We also propose a logic metaprogram which implements the method. 1
From Extensional to Intensional Knowledge: Inductive Logic Programming Techniques and Their Application to Deductive Databases
- Transactions and Change in Logic Databases, volume 1472 of Lecture
, 1998
"... This chapter aims at demonstrating that inductive logic programming (ILP), a recently established subfield of machine learning that induces first-order clausal theories from examples, combines very well with the area of deductive databases. In the context of deductive databases, induction can be ..."
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Cited by 9 (3 self)
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This chapter aims at demonstrating that inductive logic programming (ILP), a recently established subfield of machine learning that induces first-order clausal theories from examples, combines very well with the area of deductive databases. In the context of deductive databases, induction can
A Logic Database System with Extended Functionality 1
"... We present the architecture and design details of a logic database system that extends functionality in a number of ways. The system supports indefinite (non-Horn) facts in extensional database (EDB) and existential quantification in intensional database (IDB) rules. Semantic query optimization is i ..."
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We present the architecture and design details of a logic database system that extends functionality in a number of ways. The system supports indefinite (non-Horn) facts in extensional database (EDB) and existential quantification in intensional database (IDB) rules. Semantic query optimization
Using ACTs in Disjunctive Deductive Databases
, 1996
"... This paper describes research efforts to develop efficient implementation techniques for disjunctive deductive databases. The aim is to build a database engine that produces perfect model semantics as introduced by Przymusinski. When used with positive disjunctive databases the results would be e ..."
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database and then uses set-at-a-time evaluation to run the newly developed trees against the extensional database. Keywords: Clause trees, Access Clause Trees (ACT s), Perfect Model Semantics (PMS), merge path, priority relation, preference relation, perfect model, Disjunctive Deductive Databases (DDDB
Constraints, inference channels and secure databases
- In the 6th International Conference on Principles and Practice of Constraint Programming
, 2000
"... Abstract. This paper investigates the problem of con dentiality violations via illegal data inferences that occur when arithmetic constraints are combined with non-con dential numeric data to infer con dential information. The database is represented as a pointinan(n+k)-dimensional constraint space, ..."
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Cited by 7 (6 self)
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, where n is the number of numerical data items stored in the database (extensional database) and k is the number of derivable attributes (intensional database). Database constraints over both extensional and intensional databases form an (n + k)-dimensional constraint object. A query answer over a data
Refining Extensional Relationships and Existence Requirements for Incremental Schema Integration
, 1998
"... Schema integration as part of the database design as well as of the database integration process has to deal with extensional relationships among classes of the different schemata to be integrated. As a rule, the extensional relationships must be specified by the database designer. Partially, some r ..."
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Schema integration as part of the database design as well as of the database integration process has to deal with extensional relationships among classes of the different schemata to be integrated. As a rule, the extensional relationships must be specified by the database designer. Partially, some
Schema Integration and View Derivation by Resolving Intensional and Extensional Overlappings
- In 9th ICSA International Conference on Parallel and Distributed Computing Systems
, 1996
"... The integration of schemata is a very essential but also a very complex task in a federated database environment. Especially the integration of different inheritance hierarchies into one hierarchy is not satisfactorily solved up to now. We show, why some existing approaches fail and propose a new al ..."
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Cited by 2 (0 self)
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The integration of schemata is a very essential but also a very complex task in a federated database environment. Especially the integration of different inheritance hierarchies into one hierarchy is not satisfactorily solved up to now. We show, why some existing approaches fail and propose a new
Results 11 - 20
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148
