(r5rs.info.gz) Other notations

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(r5rs.info.gz) Lexical conventions

 
 2.3 Other notations
 ===================
 
 For a description of the notations used for numbers, see section 
 Numbers.
 
 . + -
      These are used in numbers, and may also occur anywhere in an
      identifier except as the first character.  A delimited plus or
      minus sign by itself is also an identifier.  A delimited period
      (not occurring within a number or identifier) is used in the
      notation for pairs (section  Pairs and lists), and to
      indicate a rest-parameter in a  formal parameter list (section
       Procedures).  A delimited sequence of three successive
      periods is also an identifier.
 
 ( )
      Parentheses are used for grouping and to notate lists (section
       Pairs and lists).
 
 '
      The single quote character is used to indicate literal data
      (section  Literal expressions).
 
 `
      The backquote character is used to indicate almost-constant data
      (section  Quasiquotation).
 
 , ,@
      The character comma and the sequence comma at-sign are used in
      conjunction with backquote (section  Quasiquotation).
 
 "
      The double quote character is used to delimit strings (section
       Strings).
 
 \
      Backslash is used in the syntax for character constants (section
       Characters) and as an escape character within string
      constants (section  Strings).
 
 [ ] { } |
      Left and right square brackets and curly braces and vertical bar
      are reserved for possible future extensions to the language.
 
 #
      Sharp sign is used for a variety of purposes depending on the
      character that immediately follows it:
 
 #t #f
      These are the boolean constants (section  Booleans).
 
 #\
      This introduces a character constant (section  Characters).
 
 #(
      This introduces a vector constant (section  Vectors).
      Vector constants are terminated by ) .
 
 #e #i #b #o #d #x
      These are used in the notation for numbers (section  Syntax
      of numerical constants).
 
 

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