The convention in this manual is to show command names and keywords in upper-case, and substitutable values in lower-case italic.

Note, however, that command entry in the sort-file is not case-sensitive.

Optional quantities are enclosed in square brackets, e.g. 〚 optvar 〛.

The letter "r"' following a quantity indicates that the item may be repeated.

Alternative quantities are denoted by |, so a|b indicates either a or b.

In the commands section wherever statements is used it refers to either a simple statement (single command) or a complex statement (group of commands enclosed within curly braces), i.e.

statements  ->  single-command
                | 
                {
                  single-command
                  single-command
                 ...
                }