GeoSPARQL is a new OGC standard that adds spatial functions to the SPARQL query language for RDF to allow spatial data access for the geospatial Semantic Web. See http://www.opengeospatial.org/standards/geosparql for more information on the standard. (333E)
There are two interesting papers to read to learn about GeoSPARQL: (3DSK)
Dave Kolas and Robert Battle [ GeoSPARQL User Guide ] Technical Report. 2012. (3DSJ)
Robert Battle and Dave Kolas, [ "Enabling the Geospatial Semantic Web with Parliament and Geo-SPARQL."] by IOS Press, also available at http://www.semantic-web-journal.net/content/enabling-geospatial-semantic-web-parliament-and-geosparql (3DSL)