Diagram = getResourceOrNull(graph, URIs.Diagram);
Diagram_MappedDiagram = getResourceOrNull(graph, URIs.Diagram_MappedDiagram);
Diagram_MappedFromDiagram = getResourceOrNull(graph, URIs.Diagram_MappedFromDiagram);
Diagram = getResourceOrNull(graph, URIs.Diagram);
Diagram_MappedDiagram = getResourceOrNull(graph, URIs.Diagram_MappedDiagram);
Diagram_MappedFromDiagram = getResourceOrNull(graph, URIs.Diagram_MappedFromDiagram);