assertion	retraction	graph	subject	predicate	object	datatype	annotation
1	0	graph	DOID:4072	oio:id	DOID:4072	xsd:string	
1	0	graph	DOID:1737	rdfs:subClassOf	DOID:4072	_IRI	
1	0	graph	DOID:10021	rdfs:subClassOf	DOID:4072	_IRI