Query Answering System in semantic web -OWL 2 DL Extension

Abstract

In addition to the Semantic Web applications' growth, a growing amount of data has been observed, which got consumed and published on the Semantic Web. Presently a number of manager in addition to the application developers, with this data proliferation, are asking questions when they are given accessibility to an instance data collection. A main question is under what conditions and is the data is all set to be used. For answering this question, few mechanisms of data validation are required for ensuring integrity and correctness of data. Whilst validation of semantics and syntax is assisted through existing tools, the Semantic Web is still deficient in support of IC (Integrity Constraint). The suggested language of standard knowledge representation, i.e., OWL (Web Ontology Language), entails a standard semantics, which espouses the OWA (Open World Assumption) and the nUNA (non-Unique Name Assumption). Both of these suppositions are apposite for a number of scenarios of distributed knowledge representation on the Semantic Web. Within characteristic settings of Semantic Web, the knowledge regarding the domain is frequently derived from distributed sources and absolute knowledge regarding the domain could not be supposed. Nonetheless, within a number of settings, specific components of the domain are anticipated of having absolute knowledge accessible and validation of integrity constraint is enviable. Within such settings it will be anticipated that the CWA (Closed World Assumption) and the UNA (Unique Names Association) are employed.

Table fo Contents

Abstract2

Introduction4

Contribution And Novelty Of The Work4

DL-SROIQ and DLs (Description Logics)8

(EDLs) Epistemic Description Logics9

Conjunctive Query Answering10

Integrity Constraints in Databases11

Approaches Based on Epistemic Queries13

Conclsuion14

Query Answering System in semantic web - OWL 2 DL Extension

Introduction

The Semantic Web is the World Wide Web's new generation within which the information's semantics (i.e., meaning) on the web is specified in a way that the web content could be processed and understood by the machines intelligently and automatically. The Semantic Web consists of the standard languages like SPARQL, OWL, RDFS, and RDF, which shape up the stack of Semantic Web (Calvanese, 2011).

RDF (Resource Description Framework) lies at the base of the stack of Semantic Web. Resource Description Framework is the language, whcih symbolizes information regarding the web resources in the outline of triples in which every triple comprises of an object, a subject and a predicate.

Contribution And Novelty Of The Work

Within this study, we have offered a method, which props up ICs (Integrity Constraints) on the Semantic Web. Much specifically, we have evaluated and designed a method that is the extension of OWL2DL for being utilized as an integrity constraint language. The present paper is significant for the community of Semantic Web in the aspects mentioned below:

It props up the detection of non-trivial violation within the instance data of Semantic Web, in which the rcs and the deductions entailed can be intricate. Such capability of checking the integrity of non-trivial data goes past the relational databases' integrity constraints. Thus, this thesis work offers a strong solution to the repair, explanation, validation and representation of data ...