Gquery : a Query Language for Gml

XML has established itself as the standard for representing data in scientific and business applications, leading to several dialects and tools for XML data processing. In this paper we are interested in querying geographic data encoded in GML, the Geography Markup Language adopted by the OpenGIS consortium (OGC) for the description, transmission and storage of geographic data. Although it is anticipated that GML will appeal to a large class of GIS users, OGC did not recommend a specific language for querying GML data. On the other hand, the database community, in both the academia and the industry, has been very pro-active in the design and implementation of XQuery, a query language for XML. In this paper, we present our XQuery based approach and system for querying