The following are valid characters used as delimiters for identifiers, reserved words, and numeric literals: space, comma, left parenthesis (, right parenthesis), less than <, greater than >, equals =, asterisk *, slash /, not ¬, ampersand &, vertical bar |, and colon :.
You can use apostrophes (') and quotation marks (") interchangeably to delimit alphanumeric literals, but the leading and final delimiter must match.
Identifiers, literals, labels, and reserved words can appear in the right‑most and left‑most columns of the source record.
Anything to the right of a colon (:) or double hyphens (‑‑) is treated as a comment.
You cannot break words from one line to the next.
You can leave lines blank.
See the definitions of names, identifiers, literals, functions, and so on earlier in this chapter for further information about permitted use.
Labels of procedures, FOR constructs, and loops take the form:
