The modulus in the CAD system drawings as a base of developing of the   problem-oriented extensions
  The concept of the "modulus" in the CAD system drawings is characterized, being a base of developing of the problem-oriented extensions. The modulus consists of visible geometric elements of the drawing and invisible parametric representation of the modelling object. The technological advantages of moduluss in a complex CAD system developing are described. 
Vladimir V. Migunov