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Flexible Intensional Query-Answering for RDF Peer-to-Peer Systems [chapter]

Zoran Majkić
2006 Lecture Notes in Computer Science  
We show that it adequately models robust weakly-coupled framework of RDF ontologies and supports decidable query answering for the union of conjunctive queries. expressed in the RDF syntax: principal motivation  ...  We consider the Peer-To-Peer (P2P) database systems with RDF ontologies and with the semantic characterization of P2P mappings based on logical views over local peer's ontology.  ...  Query answering in RDF based P2P system: The fundamental question is how to use these intensional equivalences of views in order to be able to compute the query answer in the actual world.  ... 
doi:10.1007/11766254_60 fatcat:nd3qxphv7zapznegdybap4z77e

Speaking Words of WISDOM: Web Intelligent Search based on DOMain ontologies

Sonia Bergamaschi, Paolo Bouquet, Paolo Ciaccia, Paolo Merialdo
2005 Semantic Web Applications and Perspectives  
in this paper we present the architecture of a system for searching and querying information sources available on the web which was developed as part of a project called WISDOM. key feature of our proposal  ...  is a distributed architecture based on (i) the peer-to-peer paradigm and (ii) the adoption of domain ontologies. at the lower level, we support a strong, ontology-based integration of the information  ...  Providing effective and efficient methods for answering queries in such a scenario is the challenging task of the project.  ... 
dblp:conf/swap/BergamaschiBCM05 fatcat:tcecvnemvbbs7ogocwjhfpc5pu

Hyper: A Framework for Peer-to-Peer Data Integration on Grids [chapter]

Diego Calvanese, Giuseppe De Giacomo, Maurizio Lenzerini, Riccardo Rosati, Guido Vetere
2004 Lecture Notes in Computer Science  
Peer-to-peer data integration aims at overcoming these drawbacks by modeling autonomous information systems as peers, and establishing mappings among peers without resorting to any hierarchical structure  ...  In this paper, we present Hyper, a joint research initiative of Università di Roma "La Sapienza" and IBM Italia, which aims at developing principles and techniques for peer-to-peer data integration on  ...  More specifically, we define the two main functionalities that each peer must provide in order to answer a user query to any peer in the system.  ... 
doi:10.1007/978-3-540-30145-5_9 fatcat:ujxvrjsyejbddardjpllg4iczi

Scientific Foundations [chapter]

2010 Epilepsy  
Mediation for the Semantic Web and Peer to Peer Systems Keywords: RDF, composition of resources, distributed mediation, inconsistency, peer-to-peer systems.  ...  them to answer XQuery queries.  ... 
doi:10.1201/9781420085594-s1 fatcat:exqlg2zybvaxbklrwpwp25vtcm

Scientific Foundations [chapter]

I. Scott MacKenzie
2013 Human-computer Interaction  
Mediation for the Semantic Web and Peer to Peer Systems Keywords: RDF, composition of resources, distributed mediation, inconsistency, peer-to-peer systems.  ...  them to answer XQuery queries.  ... 
doi:10.1016/b978-0-12-405865-1.00004-2 fatcat:sa5jemmdx5eadmam3vazc2neca

Scientific Foundations [chapter]

2012 Skill Training in Multimodal Virtual Environments  
Mediation for the Semantic Web and Peer to Peer Systems Keywords: RDF, composition of resources, distributed mediation, inconsistency, peer-to-peer systems.  ...  them to answer XQuery queries.  ... 
doi:10.1201/b12704-2 fatcat:xwkqf6bon5cptdznwziyx4awmi

Scientific Foundations [chapter]

2010 Epilepsy  
Mediation for the Semantic Web and Peer to Peer Systems Keywords: RDF, composition of resources, distributed mediation, inconsistency, peer-to-peer systems.  ...  them to answer XQuery queries.  ... 
doi:10.1201/ebk1420085594-s1 fatcat:6fnqabsivrdwtkoz45enhr7ijy

Building CMS-based Web applications using a model-driven approach

Feliu Trias
2012 2012 Sixth International Conference on Research Challenges in Information Science (RCIS)  
Citation for published version (APA): Vdovják, R. (2005). A model-driven approach for building distributed ontology-based web applications.  ...  Eindhoven: Technische Universiteit Eindhoven. https://doi.org/10.6100/IR589984 A model-driven approach for building distributed ontology-based web applications / by Richard Vdovják.  ...  The user poses a query against one of the mediators and the peers in the system cooperate in order to deliver the answer faster.  ... 
doi:10.1109/rcis.2012.6240465 dblp:conf/rcis/Trias12 fatcat:bhbsaprjfbgcvpffjr6ooeljge

Acquiring Ontology Axioms through Mappings to Data Sources

Floriana Di Pinto, Giuseppe De Giacomo, Domenico Lembo, Maurizio Lenzerini, Riccardo Rosati
2019 Future Internet  
The challenge in this setting is to design efficient algorithms for answering queries posed to MKBs.  ...  Besides the definition of MKBs, our main contribution is to prove that answering instance queries posed to MKBs expressed in Hi ( DL-Lite R ) can be done efficiently.  ...  Indeed, looking for query answering algorithms that are tractable in data complexity is a distinguishing characteristic of OBDA systems.  ... 
doi:10.3390/fi11120260 fatcat:7is45e4ng5byzfpfuattqptwuu

SPARQL query rewriting for implementing data integration over linked data

Gianluca Correndo, Manuel Salvadores, Ian Millard, Hugh Glaser, Nigel Shadbolt
2010 Proceedings of the 1st International Workshop on Data Semantics - DataSem '10  
This paper presents an algorithm for achieving RDF data mediation based on SPARQL query rewriting.  ...  The approach is based on the encoding of rewriting rules for RDF patterns that constitute part of the structure of a SPARQL query. of data sets, published in RDF format, is emerging, fuelled primarily  ...  Although in this work we intended to implement a particular semantics that could be used to translate the intensional definition of an answer set (i.e. a query) and not only grounded data.  ... 
doi:10.1145/1754239.1754244 dblp:conf/edbtw/CorrendoSMGS10 fatcat:o7vitarxzvblvm5bmlcjgwdyay

PeerTrust: Automated Trust Negotiation for Peers on the Semantic Web [chapter]

Wolfgang Nejdl, Daniel Olmedilla, Marianne Winslett
2004 Lecture Notes in Computer Science  
Such policies will be one component of a run-time system that can negotiate to establish trust on the Semantic Web.  ...  Finally, we discuss related work and identify areas for further research.  ...  Each peer can control how much effort it is willing to exert to help other peers; most peers will only be willing to answer a few kinds of queries, and those only for a few kinds of requesters.  ... 
doi:10.1007/978-3-540-30073-1_9 fatcat:vhxu3fgphvfddp45vl7x6idrku

Models for semantic interoperability in service-oriented architectures

G. Vetere, M. Lenzerini
2005 IBM Systems Journal  
We also provide some guidelines for selecting one of the possible interoperability models.  ...  Then we analyze four basic models of semantic interoperability that differ in respect to their mapping between service descriptions and ontologies and in respect to where the evaluation of the integration  ...  For this reason, we could refer to them as pure peer-topeer systems.  ... 
doi:10.1147/sj.444.0887 fatcat:gxuxj7xibbam3ff55lagbn2js4

Data Retrieval and Evolution on the (Semantic) Web: A Deductive Approach [chapter]

François Bry, Tim Furche, Paula-Lavinia Pătrânjan, Sebastian Schaffert
2004 Lecture Notes in Computer Science  
To make use of data represented on the Semantic Web, it is necessary to provide languages for Web data retrieval and evolution.  ...  This article introduces into the (conventional and Semantic) Web query language Xcerpt and the event and update language XChange, and shows how their deductive capabilities make them well suited for querying  ...  This research has been funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REWERSE number 506779 (cf. http://rewerse.net  ... 
doi:10.1007/978-3-540-30122-6_3 fatcat:77utfeoa2bbnlb3i7rhlrdiubq

Networked graphs

Simon Schenk, Steffen Staab
2008 Proceeding of the 17th international conference on World Wide Web - WWW '08  
A simple declarative mechanism for reusing and combining RDF data would help users to generate content for the semantic web.  ...  We propose Networked Graphs, which allow users to define RDF graphs both, by extensionally listing content, but also by using views on other graphs.  ...  If a cycle is detected, subsequent queries are not forwarded to other peers. The received query is only evaluated on local data and the result is returned.  ... 
doi:10.1145/1367497.1367577 dblp:conf/www/SchenkS08 fatcat:gkmarqyptzappoouysqsra4g3m

Using OWL in Data Integration [chapter]

Diego Calvanese, Giuseppe De Giacomo, Domenico Lembo, Maurizio Lenzerini, Riccardo Rosati, Marco Ruzzi
2009 Semantic Web Information Management  
Then, we show how to limit the expressive power of the various components of the framework in order to have efficient query answering, in principle as efficient as query processing in relational DBMSs.  ...  complexity of query answering under different instantiations of the framework in terms of query language and form and interpretation of the mapping.  ...  Queries are posed to one peer, and the role of query processing is to exploit both the data that are internal to the peer, and the mappings between the peer and the other peers in the system.  ... 
doi:10.1007/978-3-642-04329-1_17 fatcat:tll42v56mzfbfmditjlz56j7uq
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