C.2 Context-Free Syntax

The grammar in this section uses uppercase words for nonterminal symbols, allowing also hyphens. All other characters stand for themselves, with the following exceptions:

• `::=' and `|' are generally used as meta-notation, as in BNF;
• A string of characters enclosed in double quotation marks `"..."' always stands for the enclosed characters themselves;
• `N t...t N' indicates one or more repetitions of the nonterminal symbol N separated by the terminal symbol t (which is usually a comma or semicolon);
• `N...N' is simply one or more repetitions of N (occasionally, N here is a sequence of terminal and nonterminal symbols, such as `[ SPEC ]';
• `var/vars' indicates that the singular and plural forms may be used interchangeably, and similarly for other keywords; `end/' indicates that the use of `end' is optional, and similarly for semicolons: `;/'.