assertion  retraction  graph  subject       predicate      object        datatype    annotation
1          0           graph  DOID:0080903  oio:hasDbXref  MESH:D018242  xsd:string  
1          0           graph  DOID:0050902  oio:hasDbXref  MESH:D018242  xsd:string  
1          0           graph  DOID:7398     oio:hasDbXref  MESH:D018242  xsd:string  
1          0           graph  DOID:4790     oio:hasDbXref  MESH:D018242  xsd:string