anchor.diff:  (defclass  x3d-array-field ()
     ()
     (:documentation "
  -ISO/IEC 19775-1:2008
  +ISO/IEC 19775-1:2008 (SEE NOTICE.TXT)
   
   5.2.2 X3DArrayField
   
  
positive.code: (defclass  mf-image (x3d-array-field)
    ()
    (:documentation "
  ISO/IEC 19775-1:2008
  
  5.3.6 SFImage and MFImage
  
  
negative.code: (defclass  mf-time (x3d-array-field)
    ()
    (:documentation "
  ISO/IEC 19775-1:2008 (SEE NOTICE.TXT)
  
  5.3.15 SFTime and MFTime
  
  