1.6

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1.6

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1 General [intro] 1.6 Syntax notation [syntax]	1 总则【总则】 1.6 语法表示法【语法】
In the syntax notation used in this International Standard, syntactic categories are indicated by italic type, and literal words and characters in `constant width` type. Alternatives are listed on separate lines except in a few cases where a long set of alternatives is presented on one line, marked by the phrase “one of.” An optional terminal or nonterminal symbol is indicated by the subscript “opt,” so { expression_opt } indicates an optional expression enclosed in braces.	在本标准使用的语法表示法中，语法范畴由倾斜字体表示，字面的词汇和字符用`等宽字体`表示。除了少量情况用带有“之一”语句标志的一整行列出长串的候选条目外，都分列在单独的行上。可选的终结标记或非终结标记被标以“opt”下标，于是 { 表达式_opt } 表示被包围在花括号中的一个可选表达式。
Names for syntactic categories have generally been chosen according to the following rules: X-name is a use of an identifier in a context that determines its meaning (e.g. class-name, typedef-name). X-id is an identifier with no context-dependent meaning (e.g. qualified-id). X-seq is one or more X's without intervening delimiters (e.g. declaration-seq is a sequence of declarations). X-list is one or more X's separated by intervening comma (e.g. expression-list is a sequence of expressions separated by commas).	选择语法范畴的名字通常依据以下规则选择：某-名称表示通过上下文决定的某个标识符（比如类-名称，类型定义-名称）。某-标识符表示上下文无关的标识符（比如限定-标识符）。某-序列表示一个或多个无分隔符的某条目（比如声明-序列是一系列声明）。某-列表表示一个或多个被逗号分隔的某条目（比如表达式-列表是一系列被逗号分隔的表达式）。
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