The modular technology of development of the CAD expansions: profiles of   outside networks of water supply and water drain
  The modular technology of development of the problem-oriented CAD expansions is applied to a task of designing of profiles of outside networks of water supply and water drain with realization in program system TechnoCAD GlassX. The unity of structure of this profiles is revealed, the system model of the drawings of profiles of networks is developed including the structured parametric representation (properties of objects and their interdependence, general settings and default settings) and operations with it, which efficiently automate designing 
Vladimir V. Migunov, Rustem R. Kafiyatullov, Ilsur T. Safin