subject	object
http://www.openlinksw.com/schemas/virtrdf#DefaultQuadMap	http://www.openlinksw.com/schemas/virtrdf#SPART_QM_OK_FOR_ANY_QUAD
http://www.openlinksw.com/schemas/virtrdf#DefaultServiceMap	http://www.openlinksw.com/schemas/virtrdf#SPART_QM_OK_FOR_ANY_QUAD