assertion  retraction  graph  subject     predicate            object            datatype    annotation
1          0           graph  DOID:10290  oio:hasOBONamespace  disease_ontology  xsd:string  
1          0           graph  DOID:8352   oio:hasOBONamespace  disease_ontology  xsd:string  
1          0           graph  DOID:8110   oio:hasOBONamespace  disease_ontology  xsd:string