Summary
The aim of the Edutella project is to provide a peer-to-peer infrastructure for educational material retrieval using semantic web meta-data descriptions of educational resources. Edutella uses the semantic web metadata description languages RDF and RDF-Schema for describing web resources. The aim of this work is to wrap the Edutella infrastructure with a functional mediator system. This makes it possible to define general functional queries and views over educational and other material described using RDF and RDF-Schema. It is based on the observation that RDF-Schema definitions are easily mapped into a functional data model. This allows any RDF-Schema file to be wrapped by a functional mediator system. The RDF-Schema definitions are translated into a corresponding functional meta-data schema consisting of a type hierarchy and a set of functions. Queries then can be expressed in terms of the translated semantic functional schema. Since meta-data descriptions can contain both RDF and RDF-Schema definitions, the system allows both to co-exist with the difference that queries over basic RDF meta-data are expressed on a lower level in terms of a generic functional schema representing all RDF structures.
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References
M. Bendtsen and M. Björknert: Transparent Java Access to Mediated Database Objects, http://user.it.uu.se/~udbl/publ/ace.pdf, 2001
D. Brickley and R.V. Guha: RDF Vocabulary Description Language 1.0: RDF-Schema, WC3 Working Draft, http://www.w3.org//TR/rdf-schema, 2003.
J. Carroll: ARP: Another RDF Parser, http://www-uk.hpl.hp.com/people/jjc/arp/, 2001.
K. Cassei and T. Risch: An Object-Oriented Multi-Mediator Browser. 2nd International Workshop on User Interfaces to Data Intensive Systems, Zürich, Switzerland, 2001.
Dublin Core Metadata Initiative, http://dublincore.org/, 2003.
G. Fahl and T. Risch: Query Processing over Object Views of Relational Data. The VLDB Journal, 6(4), 261–281, 1997.
V.Josifovski, T. Katchaounov, and T. Risch: Optimizing Queries in Distributed and Composable Mediators. 4th Conference on Cooperative Information Systems CoopIS’99, 291–302, 1999.
T. Katchaounov, V. Josifovski, and T. Risch: Scalable View Expansion in a Peer Mediator System, Proc. 8th International Conference on Database Systems for Advanced Applications (DASFAA 2003), Kyoto, Japan, 2003.
G. Klyne and J.J. Carroll: Resource Description Framework (RDF): Concepts and Abstract Syntax, W3C Working Draft, http://www.w3.org/TR/rdf-concepts/, 2003.
M. Koparanova and T. Risch: Completing CAD Data Queries for Visualization, International Database Engineering and Applications Symposium (IDEAS 2002), Edmonton, Alberta, Canada, July 17–19, 2002.
W. Neidl, B. Wolf, C. Qu, S. Decker, M. Sinek, A. Naeve, M. Nilsson, M. Palmer, and T. Risch: EDUTELLA: A P2P Networking Infrastructure Based on RDF. 11th International World Wide Web Conference (WWW2002), Honolulu, Hawaii, USA, 2002.
M. Nilsson, M. Palmèr, A. Naeve: Semantic Web Meta-data for e-Learning- Some Architectural Guidelines, 11th World Wide Web Conference (WWW2002), Hawaii, USA, 2002.
S. Oaks, B. Traversat, and L. Gong: JXTA in a Nutshell, ISBN 0–596-00236-X, O’Reilley, 2002.
T. Risch, V. Josifovski, T. Katchaounov: Functional Data Integration in a Distributed Mediator System, in P. Gray, L. Kerschberg, P. King (eds.): Functional Approach to Computing with Data, Springer, 2003.
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Risch, T. (2004). Functional Queries to Wrapped Educational Semantic Web Meta-Data. In: Gray, P.M.D., Kerschberg, L., King, P.J.H., Poulovassilis, A. (eds) The Functional Approach to Data Management. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05372-0_19
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DOI: https://doi.org/10.1007/978-3-662-05372-0_19
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