The nanosafety knowledge graph RDF aims to follow the data models provided by the NPO (30) and the BioAssay Ontology (BAO) , two ontologies also reused in the eNM ontology . Other ontologies used are the ChEBI ontology and Vocabulary of Interlinked Datasets (VoID) . Properties were added from the BAO, Chemical Information Ontology , NPO , and Semanticscience Integration Ontology . This activity resulted in a model where the following entities were modeled as typed resources (i.e., have an rdf:type triple):