anchor.diff:  ;; -----------------------------------------------------------------------class
   (defclass  transform  (x3d-grouping-node)
     ((center :initarg :center
  -         :initform (error ":center must be specified")
  -         :accessor center
  -         :type sf-vec3f
  -         :allocation :instance
  -         :documentation "")
  +           :initform (sf-vec3f 0 0 0)
  +           :accessor center
  +           :type sf-vec3f
  +           :allocation :instance
  +           :documentation "")
      (rotation :initarg :rotation
  -         :initform (error ":rotation must be specified")
  -         :accessor rotation
  -         :type sf-rotation
  -         :allocation :instance
  -         :documentation "")
  +             :initform (sf-rotation 0 0 1 0)
  +             :accessor rotation
  +             :type sf-rotation
  +             :allocation :instance
  +             :documentation "")
      (scale :initarg :scale
  -         :initform (error ":scale must be specified")
  -         :accessor scale
  -         :type sf-vec3f
  -         :allocation :instance
  -         :documentation "")
  -   (sale-orientation :initarg :sale-orientation
  -         :initform (error ":sale-orientation must be specified")
  -         :accessor sale-orientation
  -         :type sf-rotation
  -         :allocation :instance
  -         :documentation "")
  -   (transation :initarg :transation
  -         :initform (error ":transation must be specified")
  -         :accessor transation
  -         :type sf-vec3f
  -         :allocation :instance
  -         :documentation ""))
  +          :initform (sf-vec3f 1 1 1)
  +          :accessor scale
  +          :type sf-vec3f
  +          :allocation :instance
  +          :documentation "")
  +   (scale-orientation :initarg :scale-orientation
  +                     :initform (sf-rotation 0 0 1 0)
  +                     :accessor scale-orientation
  +                     :type sf-rotation
  +                     :allocation :instance
  +                     :documentation "")
  +   (translation :initarg :translation
  +               :initform (sf-vec3f 0 0 0)
  +               :accessor translation
  +               :type sf-vec3f
  +               :allocation :instance
  +               :documentation ""))
     (:documentation "
   ISO/IEC 19775-1:2008 (SEE NOTICE.TXT)
   
  
positive.code: ;; -----------------------------------------------------------------------class
  (defclass  x3d-bounded-object ()
    ((bbox-center :initarg :bbox-center
                  :initform (error ":bbox-center must be specified")
                  :accessor bbox-center
                  :type sf-vec3f
                  :allocation :instance
                  :documentation "")
     (bbox-size :initarg :bbox-size
                :initform (error ":bbox-size must be specified")
                :accessor bbox-size
                :type sf-vec3f
                :allocation :instance
  
negative.code: ;; -----------------------------------------------------------------------class
  (defclass  x3d-grouping-node (x3d-child-node x3d-bounded-object)
    ((children :initarg :children
               :initform ()
               :accessor children
               :type mf-node
               :allocation :instance
  