subscript in DOT/graphviz edge labels

问题

How do you use Graphviz/DOT's HTML features to add a subscript character to an edge label?

回答1:

Like this:

digraph g {
  1 -> 2 [label=<Regular<SUB>subscript</SUB>>];
}

来源：https://stackoverflow.com/questions/12386449/subscript-in-dot-graphviz-edge-labels