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A fleshed out version could have Water flow items as directed features of the ports.
Note also that in the code the sub-connections within the interface def WaterDelivery are made with regular connections between ports not interfaces:
interface def WaterDelivery {
end [1] port suppliedBy : SpigotBank {
port hot : Spigot;
port cold : Spigot;
}
end [1..*] port deliveredTo : Faucet {
port hot : FaucetInlet;
port cold : FaucetInlet;
}
connect suppliedBy.hot to deliveredTo.hot;
connect suppliedBy.cold to deliveredTo.cold;
}
SysML2.0: 'An interface definition is a kind of connection definition ... whose ends are restricted to be port definitions ... An interface usage is a kind of connection that is usage of an interface definition. The ends of an interface usage are restricted to be port usages.'
But the above DO NOT alone state that a regular connection (one that is not an interface) CANNOT also (instead of an interface) be used between ports.
In any case, Webel recommends that a basic connection usage NOT be used between ports. Prefer always use an interface usage.