subject object
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-G-col-G 
"G"
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-O-col-O 
"O"
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-P-col-P 
"P"
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-S-col-S 
"S"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-G-col-G 
"sinv_G"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-O-col-O 
"sinv_O"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-P-col-P 
"sinv_P"
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-S-col-S 
"sinv_S"