- Alternatives are written as
§{101¦202¦303}
. Single alternative characters don’t need braces:a¦b¦c
- Optional parts are written as
§[option]
. - Optional alternatives can be written like
§[101¦202¦303]
. - To improve legibility, a leading vertical bar is ignored.
§{
¦ choice 1
¦ choice 2