Fig. 1

The disease ontology basis for the knowledge graph. Data Preparation: ontology matching presented as cross-reference flat-file and ontological hierarchies are created using Bioportal and Ontology Lookup Service data processed by R scripts. Chronic kidney disease and its presentation from six disease ontologies perspective are shown as a diagram to give an example of a cross-reference file record. Grakn Knowledge Base: data is loaded into the database from data files with python scripts