Noob question here, as I almost never go through Switzerland just to connect. But coming from the US and switching planes in Zurich before going on to Gothenburg, Sweden, what are procedures? Since both Switzerland and Sweden are part of Schengen, does this mean you only have passport control in Switzerland? Do you have to show it again in Sweden? Where do you declare customs, and do you have to pick up luggage and drop off again, the way you do when entering the US and going onto a US internal destination?

Appreciate any advice!