subject object
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-ft 
"O"
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-geo 
"O"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-ft 
"sinv_O"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-geo 
"sinv_O"