Someone else asked about this in relation to connecting a 9V battery to the arduino part some time back (although I can't at this moment find the thread). In his case the Arduino doesn't have a suitable connector on the power jack to connect the plug into. I think thats probably why there isn't one, there isn't an easy way to make it connect to the female in breadboard in a way that will cause the connection in schematic. It would be easy enough to make one but it would only be cosmetic not particularly useful without being able to connect.
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