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The StockPort is a composite
connector and consists of an acausal connector with
the Real potential variable stock
indicating the stored amount in a reservoir and the Real
flow variable rate indicating the rate of
flow into (rate > 0) or out of
(rate < 0) the reservoir.
There are also two Boolean output variables,
which indicate whether draining the reservoir
(stopOutflow) or filling it (stopInflow)
is prohibited. Since a generic reservoir will have two ports it is
possible to allow inflows and outflows on both ports (standard) or
give the stock a clear direction of flow with one port serving as
inflow and the other as outflow
connector.