( Entry format

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 1.3.3 Entry format
 Chapters  Expressions and  Standard procedures are
 organized into entries.  Each entry describes one language feature or a
 group of related features, where a feature is either a syntactic
 construct or a built-in procedure.  An entry begins with one or more
 header lines of the form
 for required, primitive features, or
 where QUALIFIER is either "library" or "optional" as defined  in
 section  Primitive; library; and optional features.
 If CATEGORY is "syntax", the entry describes an expression type, and
 the template gives the syntax of the expression type.  Components of
 expressions are designated by syntactic variables, which are written
 using angle brackets, for example, <expression>, <variable>.  Syntactic
 variables should be understood to denote segments of program text; for
 example, <expression> stands for any string of characters which is a
 syntactically valid expression.  The notation
  <thing1> ...
 indicates zero or more occurrences of a <thing>, and
  <thing1> <thing2> ...
 indicates one or more occurrences of a <thing>.
 If CATEGORY is "procedure", then the entry describes a procedure, and
 the header line gives a template for a call to the procedure.  Argument
 names in the template are ITALICIZED.  Thus the header line
  -- procedure: vector-ref VECTOR K
 indicates that the built-in procedure vector-ref takes two arguments, a
 vector VECTOR and an exact non-negative integer K (see below).  The
 header lines
  -- procedure: make-vector K
  -- procedure: make-vector K FILL
 indicate that the make-vector procedure must be defined to take either
 one or two arguments.
 It is an error for an operation to be presented with an argument that it
 is not specified to handle.  For succinctness, we follow the convention
 that if an argument name is also the name of a type listed in section
  Disjointness of types, then that argument must be of the named
 type.  For example, the header line for vector-ref given above dictates
 that the first argument to vector-ref must be a vector.  The following
 naming conventions also imply type restrictions:
           any object
     LIST, LIST1, ... LISTJ, ...
           list (see section  Pairs and lists)
     Z, Z1, ... ZJ, ...
           complex number
     X, X1, ... XJ, ...
           real number
     Y, Y1, ... YJ, ...
           real number
     Q, Q1, ... QJ, ...
           rational number
     N, N1, ... NJ, ...
     K, K1, ... KJ, ...
           exact non-negative integer
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