Builtin_GeometryProvider = getResourceOrNull(graph, URIs.Builtin_GeometryProvider);
Builtin_HorizontalTank = getResourceOrNull(graph, URIs.Builtin_HorizontalTank);
Builtin_HorizontalTankGeometryProvider = getResourceOrNull(graph, URIs.Builtin_HorizontalTankGeometryProvider);
Builtin_GeometryProvider = getResourceOrNull(graph, URIs.Builtin_GeometryProvider);
Builtin_HorizontalTank = getResourceOrNull(graph, URIs.Builtin_HorizontalTank);
Builtin_HorizontalTankGeometryProvider = getResourceOrNull(graph, URIs.Builtin_HorizontalTankGeometryProvider);