matches these forms in sequence as if wrapped in a @code{(seq @dots{})}
subform.
-These are all valid arguments to
-the @code{rx} macro. Where the corresponding string
-regexp syntax is given, @var{A}, @var{B}, @dots{} are string regexp
-subexpressions.
+These are all valid arguments to the @code{rx} macro. All forms are
+defined by their described semantics; the corresponding string regexps
+is provided for orientation, where @var{A}, @var{B}, @dots{} denote
+(suitably bracketed) string regexp subexpressions.
@subsubheading Literals