assertion  retraction  graph  subject    predicate      object        datatype    annotation
1          0           graph  DOID:3963  oio:hasDbXref  MESH:D013964  xsd:string  
1          0           graph  DOID:1781  oio:hasDbXref  MESH:D013964  xsd:string  
1          0           graph  DOID:2891  oio:hasDbXref  MESH:D013964  xsd:string