instance
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-G-col-G
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-S-col-S
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-P-col-P
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap-O-col-O
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-G-col-G
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-S-col-S
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-P-col-P
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap-O-col-O