##Label special characters
##label escape special character semicolon brace bracket hashmark
##Colon labels are terminated by semicolons, opening square brackets and curly braces or hashmarks. Use the '\;', '\[', '\{' or '\#' escapes to insert these characters. Colon labels can be quoted, but then quotation marks also need to be escaped.
hscale=auto;
a->b:     Label with a semicolon("\;") in it;
a->b: "   Label with a semicolon(\";\") in it";
box a--b: Escapes: \{ \[ \; \# and \\.;
---: Can escape these, too: \] \} \";
: but not needed: ] } ";