Title Page -- Acknowledgments -- Abstract -- Contents -- List of Tables -- List of Figures -- Chapter 1. Introduction -- Background -- Relational Databases -- Description Logic and the Semantic Web -- Methodology -- Problem 1: Relational Database as a Semantic Web data source -- Challenge 1: Automatic Mapping of Relational Databases to Semantic Web -- Contribution 1: Direct Mapping -- Challenge 2: Execute SPARQL on Relational Data -- Contribution 2: Ultrawrap -- Problem 2: Relational Database as a Reasoner -- Challenge 3: Reasoning on a RDBMS -- Contribution 3 -- Chapter 2. Preliminaries.