Digital Libraries, Joint Conference on (2003)
Houston, Texas USA
May 27, 2003 to May 31, 2003
Zehua Liu , Nanyang Technological University
Ee-Peng Lim , Nanyang Technological University
Wee-Keong Ng , Nanyang Technological University
Dion H. Goh , Nanyang Technological University
G-Portal is a web portal system providing a range of digital library services to access geospatial and georeferenced resources on the Web. Among them are the storage and query subsystems that provide a central repository of metadata resources organized under different projects. In GPortal, all metadata resources are represented in XML (Extensible Markup Language) and they are compliant to some resource schemas de.ned by their creators. The resource schemas are extended versions of a basic resource schema making it easy to accommodate all kinds of metadata resources while maintaining the portability of resource data. To support queries over the geospatial and georeferenced metadata resources, a XQuery-like query language known as RQL (Resource Query Language) has been designed. In this paper, we present the RQL language features and provide some experimental .ndings about the storage design and query evaluation strategies for RQL queries.
Z. Liu, E. Lim, D. H. Goh and W. Ng, "On Querying Geospatial and Georeferenced Metadata Resources in G-Portal," Digital Libraries, Joint Conference on(JCDL), Houston, Texas USA, 2003, pp. 245.