(r5rs.info.gz) Identifiers

(r5rs.info.gz) Lexical conventions

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 2.1 Identifiers
 ===============
 
 Most identifiers allowed by other programming languages are also
 acceptable to Scheme.  The precise rules for forming identifiers vary
 among implementations of Scheme, but in all implementations a sequence
 of letters, digits, and "extended alphabetic characters" that begins
 with a character that cannot begin a number is an identifier.  In
 addition, `+', `-', and `...' are identifiers.  Here are some examples
 of identifiers:
 
 
      lambda                   q
      list->vector             soup
      +                        V17a
      <=?                      a34kTMNs
      the-word-recursion-has-many-meanings
 
 Extended alphabetic characters may be used within identifiers as if
 they were letters.  The following are extended alphabetic characters:
 
 
      ! $ % & * + - . / : < = > ? @ ^ _ ~
 
 See section  Lexical structure for a formal syntax of
 identifiers.
 
 Identifiers have two uses within Scheme programs:
 
    * Any identifier may be used as a variable or as a syntactic keyword
      (see sections  Variables; syntactic keywords; and regions
      and  Macros).
 
    * When an identifier appears as a literal or within a literal (see
      section  Literal expressions), it is being used to denote a
      _symbol_ (see section  Symbols).

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