assertion  retraction  graph  subject    predicate      object        datatype    annotation
1          0           graph  DOID:3847  oio:hasDbXref  MESH:D003397  xsd:string  
1          0           graph  DOID:3846  oio:hasDbXref  MESH:D003397  xsd:string  
1          0           graph  DOID:3840  oio:hasDbXref  MESH:D003397  xsd:string