hscale=auto, numbering=yes;

numbering.format = "roman";
a->b: Lowercase roman;
numbering.format = "ABC)";
a->b: Uppercase letters;
numbering.format = "123";
a->b: Arabic numbers;
{
  numbering.append = ".123";
  a->b: Two-level numbers;
  a->b: Set last number [number=5];
};
a->b: Back to one level;
box a--b: Alternative \#1 {
  numbering.append = "abc";
  a->b: Step \N;
  b->a: Step \N;
}
a..b: Alternative \#2 {
  numbering.append = "abc";
  a->b: Step \N;
  b->a: Step \N [number=c];
  numbering.format = "roman-roman";
  a->b: Exotic format;
  numbering.format = "roman";
  a->b: Only the last number;
  numbering.format = "123abc";
  a->b: Back to normal;
};
a->b: Back to one level;

