Querying the Semantic Web with RQL

Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of voluminous repositories of resource metadata. The Resource Description Framework (RDF) enables the creation and exchange of metadata as any other Web data. Although large volumes of RDF desc...

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Bibliographic Details
Published in:Computer networks (Amsterdam, Netherlands : 1999) Netherlands : 1999), 2003-08, Vol.42 (5), p.617-640
Main Authors: Karvounarakis, G., Magganaraki, A., Alexaki, S., Christophides, V., Plexousakis, D., Scholl, M., Tolle, K.
Format: Article
Language:English
Subjects:
E-Marketplaces
Knowledge
Knowledge Portals
Metadata
Programming languages
RDF description bases
RDF query languages
RDF stores
Resource Description Framework-RDF
Semantic Web
Semantics
Software
SQL
Studies
Web portals
World Wide Web
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Summary:Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of voluminous repositories of resource metadata. The Resource Description Framework (RDF) enables the creation and exchange of metadata as any other Web data. Although large volumes of RDF descriptions are already appearing, sufficiently expressive declarative query languages for RDF are still missing. We propose RQL, a new query language adapting the functionality of semistructured or XML query languages to the peculiarities of RDF but also extending this functionality in order to uniformly query both RDF descriptions and schemas. RQL is a typed language, following a functional approach a la OQL and relies on a formal graph model that permits the interpretation of superimposed resource descriptions created using one or more RDF schemas. We illustrate the syntax, semantics and type system of RQL and report on the performance of RSSDB, our persistent RDF Store, for storing and querying voluminous RDF metadata.
ISSN:1389-1286
1872-7069
DOI:10.1016/S1389-1286(03)00227-5