PADIS

Pubblicazioni Aperte DIgitali Sapienza > Informatica e sistemistica "Antonio Ruberti" > INGEGNERIA INFORMATICA >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10805/1986

Title: Dealing with Inconsistencies and Updates in Description Logic Knowledge Bases
Authors: Savo, Domenico Fabio
Tutor: Lenzerini, Maurizio
Liberatore, Paolo
Keywords: Description Logics
Inconsistency
Update
Query answering
DL-Lite
Knowledge Representation
Issue Date: 27-Mar-2013
Abstract: The main purpose of an "Ontology-based Information System" (OIS) is to provide an explicit description of the domain of interest, called ontology, and let all the functions of the system be based on such representation, thus freeing the users from the knowledge about the physical repositories where the real data reside. The functionalities that an OIS should provide to the user include both query answering, whose goal is to extract information from the system, and update, whose goal is to modify the information content of the system in order to reflect changes in the domain of interest. The "ontology" is a formal, high quality intentional representation of the domain, designed in such a way to avoid inconsistencies in the modeling of concepts and relationships. On the contrary, the extensional level of the system, constituted by a set of autonomous, heterogeneous data sources, is built independently from the conceptualization represented by the ontology, and therefore may contain information that is incoherent with the ontology itself. This dissertation presents a detailed study on the problem of dealing with inconsistencies in OISs, both in query answering, and in performing updates. We concentrate on the case where the knowledge base in the OISs is expressed in Description Logics, especially the logics of the DL-lite family. As for query answering, we propose both semantical frameworks that are inconsistency-tolerant, and techniques for answering unions of conjunctive queries posed to OISs under such inconsistency-tolerant semantics. As for updates, we present an approach to compute the result of updating a possibly inconsistent OIS with both insertion and deletion of extensional knowledge.
URI: http://hdl.handle.net/10805/1986
Research interests: Knowledge Representation and Reasoning Semantic Web Description Logics Logic in Computer Science Ontology-based Information Systems Conceptual Modeling Database Theory Information Integration and Data Exchange
Personal skills keywords: Description Logics
OWL
Databases
Knowledge Representation
Ontology-based data access
Appears in PhD:INGEGNERIA INFORMATICA

Files in This Item:

File Description SizeFormat
Phd-savo.pdfPd.D. Thesis - Domenico Fabio Savo2.56 MBAdobe PDF


This item is protected by original copyright

Recommend this item

Items in PADIS are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback Sviluppo e manutenzione a cura del CINECA