// Behavior.
const real CAPACITY   = 10.0;
const real MAX_LEVEL  =  8.0;
const real INIT_LEVEL =  5.0;
const real MIN_LEVEL  =  2.0;

automaton tank:
  cont level = INIT_LEVEL;

  location open:
    initial;
    equation level' =  1.0;
    edge when level >= MAX_LEVEL goto closed;

  location closed:
    equation level' = -1.0;
    edge when level <= MIN_LEVEL goto open;
end

// Visualization.
svgfile "tank.svg";

svgout id "water" attr "height" value scale(tank.level, 0, CAPACITY, 0, 80);