(r5rs.info.gz) Literal expressions

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 4.1.2 Literal expressions
 -------------------------
 
  -- syntax: quote <datum>
  -- syntax: '<datum>
  -- syntax: <constant>
      `(quote <datum>)' evaluates to <datum>.  <Datum> may be any
      external representation of a Scheme object (see section 
      External representations).  This notation is used to include
      literal constants in Scheme code.
 
 
      (quote a)                              ==>  a
      (quote #(a b c))                       ==>  #(a b c)
      (quote (+ 1 2))                        ==>  (+ 1 2)
 
      `(quote <datum>)' may be abbreviated as '<datum>.  The two
      notations are equivalent in all respects.
 
      'a                                     ==>  a
      '#(a b c)                              ==>  #(a b c)
      '()                                    ==>  ()
      '(+ 1 2)                               ==>  (+ 1 2)
      '(quote a)                             ==>  (quote a)
      "a                                    ==>  (quote a)
 
      Numerical constants, string constants, character constants, and
      boolean constants evaluate "to themselves"; they need not be
      quoted.
 
      '"abc"                                 ==>  "abc"
      "abc"                                  ==>  "abc"
      '145932                                ==>  145932
      145932                                 ==>  145932
      '#t                                    ==>  #t
      #t                                     ==>  #t
 
      As noted in section  Storage model, it is an error to alter
      a constant (i.e. the value of a literal expression) using a
      mutation procedure like `set-car!' or `string-set!'.
 
 

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