Spinning Interoperable Applications for Teaching & Learning using the Simple Query Interface
Frans van Assche
European Schoolnet, Rue de Trèves 61, B-1040 Brussels, Belgium, Tel: +32 2 790 7575, frans.van.assche@eun.org
Erik Duval
Katholieke Universiteit Leuven, Dept. Computerwetenschappen, Celestijnenlaan 200 A, B-3001 Leuven, Belgium, Tel: +32 16 327066, erik.duval@cs.kuleuven.ac.be
David Massart
European Schoolnet, Rue de Trèves 61, B-1040 Brussels, Belgium, Tel: +32 2 790 7575, david.massart@eun.org
Daniel Olmedilla
L3S Research Center and Hannover University, Deutscher Pavillon, Expo plaza 1, D-30539 Hannover, Germany, Tel: +49 511 762.9741, olmedilla@l3s.de
Bernd Simon
Vienna University of Economics and Business Administration, Institute of Information Systems & New Media, Augasse 2-6, A-1090 Vienna, Austria, Tel: +43 1 31336 4443, bsimon@wu-wien.ac.at
Stefan Sobernig
Vienna University of Economics and Business Administration, Institute of Information Systems & New Media, Augasse 2-6, A-1090 Vienna, Austria, Tel: +43 1 31336 4443, ssobernig@wu-wien.ac.at
Stefaan Ternier
Katholieke Universiteit Leuven, Dept. Computerwetenschappen, Celestijnenlaan 200 A, B-3001 Leuven, Belgium, Tel: +32 16 327066, stefaan.ternier@cs.kuleuven.ac.be
Fridolin Wild
Vienna University of Economics and Business Administration, Institute of Information Systems & New Media, Augasse 2-6, A-1090 Vienna, Austria, Tel: +43 1 31336 4443, fwild@wu-wien.ac.at
ABSTRACT: The Web puts a huge number of learning resources within reach of anyone with Internet access. However, many valuable resources are difficult to find due to the lack of interoperability among learning repositories. In order to achieve interoperability, implementers require a common query framework. This paper discusses a set of methods referred to as Simple Query Interface (SQI) as a universal interoperability layer for educational networks. The methods proposed can be used by a source for configuring and submitting queries to a target system and retrieving results from it. The SQI interface can be implemented in a synchronous or an asynchronous manner and is independent of query languages and metadata schemas. In this paper SQI’s universal applicability has been evaluated by more than a dozen implementations demonstrated in three different case studies. SQI has been finalized as a standard in the CEN/ISSS Learning Technologies Workshop. Latest developments of SQI can be followed at http://www.prolearn-project.org/lori/.
Keywords: Educational mediators, Learning object metadata, Standards, Interoperability, Brokerage, Application Program Interface, Learning Repositories, Querying, Web Services
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