assertion  retraction  graph  subject       predicate      object       datatype    annotation
1          0           graph  DOID:0081279  oio:hasDbXref  ICDO:9421/1  xsd:string  
1          0           graph  DOID:0081260  oio:hasDbXref  ICDO:9421/1  xsd:string  
1          0           graph  DOID:4851     oio:hasDbXref  ICDO:9421/1  xsd:string