En:DOT language

digraph test123 {
               a -> b -> c;
               a -> {x y};
               b [shape=box];
               c [label="hello\nworld",color=blue,fontsize=24,fontname="Palatino-Italic",fontcolor=red,style=filled];
               a -> z [label="hi", weight=100];
               x -> z [label="multi-line\nlabel"];
               edge [style=dashed,color=red];
               b -> x;
               {rank=same; b x}
}
 
graph test123 {
               a -- b -- c;
               a -- {x y};
               x -- c [w=10.0];
               x -- y [w=5.0,len=3];
}