iv
Introduction
[ ]
Square brackets indicate that the enclosed items are optional.
{ }
When several items are enclosed by braces, one, and only one of these
elements may be selected.
Definitions
d
::= A single ASCII numeric character, 0-9.
n
::= A single ASCII non-zero, numeric character, 1-9.
<NL>
::= Newline or Linefeed (ASCII decimal 10).
<sp>
::= space character.
<white_space>
::= space(s) and tabs.