assertion  retraction  graph  subject       predicate      object       datatype    annotation
1          0           graph  DOID:0081314  oio:hasDbXref  ICDO:9506/1  xsd:string  
1          0           graph  DOID:6458     oio:hasDbXref  ICDO:9506/1  xsd:string  
1          0           graph  DOID:14174    oio:hasDbXref  ICDO:9506/1  xsd:string