Returns a construct for an array of power demand data.

def _get_demand_array_construct(self):
        """ Returns a construct for an array of power demand data.
        """
        bus_no = integer.setResultsName("bus_no")
        s_rating = real.setResultsName("s_rating") # MVA
        p_direction = real.setResultsName("p_direction") # p.u.
        q_direction = real.setResultsName("q_direction") # p.u.
        p_bid_max = real.setResultsName("p_bid_max") # p.u.
        p_bid_min = real.setResultsName("p_bid_min") # p.u.
        p_optimal_bid = Optional(real).setResultsName("p_optimal_bid")
        p_fixed = real.setResultsName("p_fixed") # $/hr
        p_proportional = real.setResultsName("p_proportional") # $/MWh
        p_quadratic = real.setResultsName("p_quadratic") # $/MW^2h
        q_fixed = real.setResultsName("q_fixed") # $/hr
        q_proportional = real.setResultsName("q_proportional") # $/MVArh
        q_quadratic = real.setResultsName("q_quadratic") # $/MVAr^2h
        commitment = boolean.setResultsName("commitment")
        cost_tie_break = real.setResultsName("cost_tie_break") # $/MWh
        cost_cong_up = real.setResultsName("cost_cong_up") # $/h
        cost_cong_down = real.setResultsName("cost_cong_down") # $/h
        status = Optional(boolean).setResultsName("status")

        demand_data = bus_no + s_rating + p_direction + q_direction + \
            p_bid_max + p_bid_min + p_optimal_bid + p_fixed + \
            p_proportional + p_quadratic + q_fixed + q_proportional + \
            q_quadratic + commitment + cost_tie_break + cost_cong_up + \
            cost_cong_down + status + scolon

        demand_data.setParseAction(self.push_demand)

        demand_array = Literal("Demand.con") + "=" + "[" + "..." + \
            ZeroOrMore(demand_data + Optional("]" + scolon))

        return demand_array