A Framework for Querying Semantic Web Data Using SPARQL-SQL Query Translation

With the fast growth of Semantic Web,more and more Resource DescriptionFramework (RDF) data are created and widelyused in Web applications and informationsystems. Recently, efficient RDF datamanagement on top of relational databases gainsparticular attentions from both Semantic Webcommunity and database community. Mostexisting RDF stores, which serve as metadatarepositories on the Semantic Web, use relationaldatabase management system (RDBMS) as abackend to manage RDF data. This paperpresents a framework for querying the semanticweb data over relational database. We alsopropose SPARQL-SQL (Simple Protocol andRDF Query Language - Structured QueryLanguage) query translation algorithm thatimplements each SPARQL algebra operator viaSQL query. And then, this translation algorithmgenerates a flat SQL statement for efficient queryprocessing by relational database query engine,and their results can be returned as SPARQLquery solutions