assertion  retraction  graph  subject     predicate            object                       datatype    annotation
1          0           graph  DOID:12897  rdfs:label           submandibular gland disease  xsd:string  
1          0           graph  DOID:12897  oio:id               DOID:12897                   xsd:string  
1          0           graph  DOID:12897  oio:hasOBONamespace  disease_ontology             xsd:string  
1          0           graph  DOID:12897  oio:hasDbXref        UMLS_CUI:C0038557            xsd:string  
1          0           graph  DOID:12897  oio:hasDbXref        MESH:D013364                 xsd:string  
1          0           graph  DOID:12897  rdfs:subClassOf      DOID:10854                   _IRI        
1          0           graph  DOID:12897  rdf:type             owl:Class                    _IRI