digraph G {
    ratio="fill";
    size="10,6!";
    margin=0;
    dpi=180;
    rankdir="LR";
    graph [fontname = "Ubuntu"];
    node [fontname = "Ubuntu"];
    edge [fontname = "Ubuntu"];
    node [shape=ellipse];
    compound=true;

    citygml [label="CityGML", shape=box3d];
    trees [label="Trees.shp", shape=note];
    floors [label="Floors.csv", shape=note];
    dreso [label="DreSo.csv", shape=note];
    lib [label="Physics.lib", shape=component];
    weather [label="Weather.csv", shape=component];
    simstadt [label="SimStadt", style=filled, shape=cylinder];



    citygml -> simstadt;
    trees -> citygml [label="add-trees.py"];
    dreso -> citygml [label="?"];
    floors -> citygml [label="add-floor.py"];
    lib -> simstadt [label="window_ratio.py"];
    weather -> simstadt;

    shp [label="Results.shp", shape=note];

    subgraph cluster_1 {
      label="Demands";
      node [shape=note];
      csv1 [label="Heat.csv"];
      csv2 [label="Cooling.csv"];
      csv3 [label="Water.csv"];
      color=lightgrey;
    }

    optimizer [label="TUM optimizer.py", style=filled, shape=cylinder];
    gis [label="ArcGIS", style=filled, shape=cylinder];

    csv3 -> optimizer [ltail=cluster_1];
    csv3 -> gis [ltail=cluster_1];

    simstadt -> shp;
    simstadt -> csv1;
    simstadt -> csv2;
    simstadt -> csv3;
    shp -> gis;



    optimizer -> lib [style=dotted];
    optimizer -> floors [style=dotted];
    gis -> trees [style=dotted];

    { rank=min; floors; trees; dreso}
    { rank=max; gis; optimizer}
}