assertion  retraction  graph  subject    predicate      object           datatype    annotation
1          0           graph  DOID:2876  oio:hasDbXref  MESH:D000077195  xsd:string  
1          0           graph  DOID:5515  oio:hasDbXref  MESH:D000077195  xsd:string  
1          0           graph  DOID:5520  oio:hasDbXref  MESH:D000077195  xsd:string