Model example
   Parameters
      p1 = 1
      p2 = 5
   End Parameters

   Variables
      v1 = 1, <3, >=0
      v2 = 2*v1, >1
      objective = 0
   End Variables

   Equations
      v1 = 2 * p1
      p1 < v2+v1 < p2
      objective = v2^2 + v1^2
   End Equations
End Model