On Querying Geospatial and Georeferenced Metadata Resources in GPortal
Conference Proceeding Article
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.
Databases and Information Systems | Numerical Analysis and Scientific Computing
Data Management and Analytics
ACM/IEEE Joint Conference on Digital Libraries (JCDL 2003)
City or Country
Houston, May 27-31
LIU, Zehua; LIM, Ee Peng; NG, Wee-Keong; and GOH, Dion Hoe-Lian.
On Querying Geospatial and Georeferenced Metadata Resources in GPortal. (2003). ACM/IEEE Joint Conference on Digital Libraries (JCDL 2003). Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/1012