Edge_HasElevation_Inverse = getResourceOrNull(graph, URIs.Edge_HasElevation_Inverse);
Edge_HasFlowArea = getResourceOrNull(graph, URIs.Edge_HasFlowArea);
Edge_HasFlowArea_Inverse = getResourceOrNull(graph, URIs.Edge_HasFlowArea_Inverse);
Edge_HasElevation_Inverse = getResourceOrNull(graph, URIs.Edge_HasElevation_Inverse);
Edge_HasFlowArea = getResourceOrNull(graph, URIs.Edge_HasFlowArea);
Edge_HasFlowArea_Inverse = getResourceOrNull(graph, URIs.Edge_HasFlowArea_Inverse);