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Table of contents
1 Introduction
2 Preliminaries
2.1 RDF data model and SPARQL query language
2.1.1 RDF graphs
2.1.2 RDF Schema
2.1.3 RDF entailment rules
2.1.4 BGP Queries
2.1.5 Query answering
2.2 Data integration
2.2.1 Theory of data integration
2.2.2 Global As View data integration
2.2.3 Local As View data integration
2.2.4 Global Local As View data integration
2.3 Summary
3 RDF query answering
3.1 Motivation and state of the art
3.1.1 RDF representations
3.1.2 Query answering techniques
3.1.3 RDF storage layouts
3.2 Complete RDFS query reformulation
3.2.1 Preliminaries: RDFS ontology and RRDFS rule set properties
3.2.2 Overview of the query reformulation technique
3.2.3 Reformulation rules associated with Rc
3.2.4 Reformulation algorithm associated with Rc
3.2.5 Reformulation with Ra
3.2.6 Reformulation with Rc [ Ra
3.2.7 Experiments
3.2.8 Reformulation for Ra-compliant graphs
3.3 RDF storage layouts for ecient query answering
3.3.1 Preliminaries
3.3.2 BGPQ answering on the T layout
3.3.3 BGPQ answering on the CP layout
3.3.4 BGPQ answering based on the TCP layout
3.3.5 Summary-based query pruning
3.3.6 Experimental evaluation
3.4 Summary
4 RDF integration of heterogeneous data sources
4.1 Motivation and state of the art
4.1.1 Mediator data models and query languages
4.1.2 Mapping Language
4.1.3 Contributions
4.2 RDF Integration Systems
4.2.1 RDF Integration System (RIS) Definition
4.2.2 Query answering problem
4.3 Query answering techniques on RDF Integration Systems
4.3.1 Materialization-based query answering strategies: MAT and MAT-CA
4.3.2 Rewriting-based query answering strategies: REW-CA, REW-C and REW
4.3.3 Rewriting fully-reformulated queries using LAV mappings: REWCA
4.3.4 Rewriting partially-reformulated queries using saturated LAV mappings: REW-C
4.3.5 Rewriting queries using saturated mappings and ontology LAV mappings: REW
4.3.6 Remarks on related techniques
4.3.7 Landscape of query answering strategies
4.4 A Platform for RDF Integration Systems: Obi-Wan
4.4.1 Query answering in Obi-Wan
4.4.2 Query rewriting and mediated plan optimizations
4.5 Experimental evaluation
4.5.1 Experimental scenarios
4.5.2 Query answering performance
4.6 Extending the framework to more general rules
4.6.1 Restricted RIS
4.6.2 Correctness of the Method
4.7 Summary
5 Conclusion and perspectives
Bibliography
