Fig. 5
From: Graph4Med: a web application and a graph database for visualizing and analyzing medical databases
Schema graph \(\mathbf {RG_2}\) transformation. The further transformation of the schema graph \(\mathbf {RG_2}\) is depicted in two steps. The left panel depicts how the remaining FK relations between some entities were resolved and how the respective nodes were replaced by relationships between the entities in \(\mathbf {RG_2}\) according to transformation step 8. For instance, the reference from Analysis to Order via the FK \(Analysis.order\_id\) was transformed to HasAnalysis. The graph data model was further refined and simplified by structural changes (e.g., pulling the AnalysisMaster into the Analysis entity) as depicted in the right panel