Universität Düsseldorf: Informatik - Lehrstuhl Datenbanken und Informationssysteme

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Aktuelles		RDQuery gains "Best Poster Award" RDQuery has gained the "Best Poster Award" at the 15th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2006) in Poděbrady, Czech Republic. Thank you for your support! 2006-10-16 17:23:34
		RDQuery v. 0.2 beta Released We are glad to announce the newest release of RDQuery. It can be downloaded from SourceForge (see below). 2006-10-11 17:20:35
		RDQuery - Querying Relational Databases on-the-fly with RDF-QL The RDQuery demo description, which will be published at the EKAW conference is now available. 2006-09-19 15:32:25
		New Relational.OWL Application Release The v 0.1 beta3 release of the Relational.OWL Application can be downloaded from SourceForge. 2006-08-30 17:52:31
		Relational.OWL Stored Procedures for Oracle 10g We are glad to announce the first release of our Relational.OWL Stored Procedures for Oracle 10g. They can be downloaded from the Relational.OWL SourceForge project. 2006-07-25 09:27:23
		New Relational.OWL Application Release The v 0.1 beta2 release of the Relational.OWL Application can be downloaded from SourceForge. 2006-07-19 17:21:51

Relational.OWL

Description

Relational.OWL is a technique to automatically extract the semantics of virtually any relational databases and transform this information automatically into RDF/OWL, processable by a wide majority of Semantic Web applications. The advantage of such an approach is obvious, since it makes relational data processable for Semantic Web applications using their built-in functionality like query languages or reasoning mechanisms. Based on this data and schema representation, the user may opt to map the resulting schema ontology to an arbitrary mapping ontology, using a semantic Web query language.

Implementation

There are two different implementations of Relational.OWL available for download at SourceForge:

Relational.OWL Application: External Java application, which implements Relational.OWL for IBM DB2 and MySQL databases. Both, automatic database to RDF and RDF to database transformations are realized.
Relational.OWL for Oracle 10g: Stored procedures for Oracle databases implemented in PL/SQL using the XML technologies provided by Oracle 10g (XSLT or XQuery). No external application is required anymore. Only the database to RDF transformation is realized in this first version.
RDQuery: RDQuery is a wrapper system which enables Semantic Web applications to access and query data actually stored in relational databases using their own built-in functionality. RDQuery automatically translates SPARQL and RDQL queries into SQL. The translation process is based on the Relational.OWL representation of relational databases and does not depend on the local schema or the underlying database management system.

Download

Relational.OWL
RDQuery

Sample Databases

	Database	Schema File	Data File
	Address	address_schema.owl	address_data.owl
	Students (german)	schema.owl	data.owl

Documentation

Publications

·	C. Pérez de Laborda, S. Conrad: Database to Semantic Web Mapping using RDF Query Languages Conceptual Modeling - ER 2006, 25th International Conference on Conceptual Modeling, Tucson, Arizona, November 2006 (to appear)
·	C. Pérez de Laborda, M. Zloch, S. Conrad: RDQuery - Querying Relational Databases on-the-fly with RDF-QL Poster and Demo Proceedings of the 15th International Conference on Knowledge Engineering and Knowledge Management, EKAW 2006, Podebrady, Czech Republic, 2nd-6th October, 2006
·	C. Pérez de Laborda, S. Conrad: Bringing Relational Data into the Semantic Web using SPARQL and Relational.OWL Semantic Web and Databases, Third International Workshop, SWDB 2006, Co-located with ICDE, Atlanta, USA, April 2006
·	C. Pérez de Laborda, S. Conrad: Querying Relational Databases with RDQL Berliner XML Tage 2005
·	C. Pérez de Laborda, S. Conrad: RelationalOWL - A Data and Schema Representation Format Based on OWL Conceptual Modelling 2005, Second Asia-Pacific Conference on Conceptual Modelling (APCCM2005), Newcastle, Australia, January 30 - February 3, 2005

URI for Databases

Description

We suggest the novel URI scheme db for identifying databases and their correpsonding schema components like tables or columns. One of the features of this scheme is that it may not only be used for relational database systems, but for virtually any type of database or data source. We therefore have combined the advantages of both global uniqueness of URIs and the high flexibility of knowledge representation with RDF as part of the Semantic Web. With this novel identifier we are now able to enhance every data record exchanged between databases with metadata: an exact and identifying location of that data in the data source. As a result not only the system administrator is able to backtrack the data to its exact position in the data source but also the database system itself.

Publications

C. Pérez de Laborda, S. Conrad:
A Semantic Web based Identification Mechanism for Databases
10th International Workshop on Knowledge Representation meets Databases(KRDB2003)

For further information please contact:
Cristian Pérez de Laborda

Last modified: December 07 2017 07:48:52.

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Heinrich-Heine-Universität Düsseldorf

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Datenbanken und Informationssysteme

Lehrstuhlinhaber

Prof. Dr. Stefan Conrad

Sekretariat

Lisa Lorenz