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    See operating CAD ..

    Joints:
    Joints are objects of submodels becoming exported into the parent model.
    Joints using the code letter J.

    Applications for Joints:

      Schematics (electrical, hydraulic, pneumatic)
           Importing points as connecting points (example)
           Text - redefine it for each inserted Submodel (example)

      Kinematics
        NOT YET IMPLEMENTED.

      Animation paths, Camera Drives
        NOT YET IMPLEMENTED.

    Joints on points:

      The corresponding point is created automatically when inserting
        this model as Submodel - the point is imported in the parent model.
      Example:
        The current model is an electrical resistance;
        the connection points are defined as joints.
        When inserting the resistance as a submodel to be
        Connection points automatically generates normal points.
        See sample_DiagEl1.gcad model.

    Joints on Notes:

      This allows to modify the text of the corresponding note -
        The text can be redefined when inserting this new model as Submodel.
      Example:
        The current model is an electrical resistance;
        a note with the resistance value is defined as a joint.
        When inserting this model, the resistance value can be redefined.
        See sample_DiagEl1.gcad model.

    CAD-Functions Joints:

    Joint-export
    Export an object of the current model as a joint.

    joint-object:
    currently only Point oder Note.

    Output:
    J1 = P20

    Joint-import

     Import an object of a Submodel.
     The Submodel-object must have been exported with Joint-export.

     Attention: all exported objects will be imported automatically
       when creating a Submodel with (M int.Model Submodel)

     This interactive feature is only for the modification
       of joint-imports necessary.

    Submodel:
      the Submodel from which the joint will be imported

    Joint:
      J# (the joint in the Submodel)

    Text:
      only for note-joints: the text that replaces the original text.

    Output:
    P20 = P20 M20 IMP
    N20 = N20 M20 IMP "new text"