Modular technology of developing of the problem-oriented extensions of a   CAD system of reconstruction of the plant
  The modular technology of creation of the problem-oriented extensions of a CAD system is described, which was realised in a system TechnoCAD GlassX for designing of reconstruction of the plants. The modularity of the technology is expressed in storage of all parameters of the design in one element of the drawing - modulus, with automatic generation of a geometrical part of the modulus from these parameters. The common principles of the system organization of extensions developing are described: separation of the part of the design to automize in this extension, architecture of parameters in the form of the lists of objects with their properties and links to another objects, separation of common and special operations, stages of the developing, boundaries of applicability of technology. 
Vladimir V. Migunov