test neato visualisation

! The above image was drawn in http://magjac.com/graphviz-visual-editor/ using the following code:

graph ER {
    fontname="Helvetica,Arial,sans-serif"
    node [fontname="Helvetica,Arial,sans-serif"]
    edge [fontname="Helvetica,Arial,sans-serif"]
    layout=neato
    node [shape=box]; theme1; "theme 2"; theme3;
    node [shape=ellipse]; resource1; "resource 2"; "resource 3"; "resource 4"; 

    theme1 -- resource1;
    theme1 -- "resource 2";
    theme3 -- "resource 2";
    theme1 -- "resource 3";
    "theme 2" -- "resource 2";
    "theme 2" -- "resource 4";  

    theme3 -- resource1;
    theme3 -- "resource 4"; 

    label = "\n\nEntity Relation Diagram\ndrawn by NEATO";
    fontsize=20;
} ```