I flew in from AMS to Switzerland on a Canadian passport. The air entry part of Schengen is supposed to take effect in March sometime so it's an international/non-Schengen travel for now. My passport was scanned but not stamped on the way in. Not sure if it was scanned on the way out but no stamps either. I do note that the Swiss use cantonal police rather than federal immigration officers to police this.
Well, I had no entry stamp. Something odd had happened upon my arrival at CDG. I was whisked past the immigration line by an airline employee, and she showed the immigration officer my passport cover (US passport) and said something in French to him, and he just waved me through. So, no stamp in my passport and no entry in the computer that I had been lawfully admitted. I didn't think much of it, as the whole int'l arrival/departure process in Europe has seemed sloppy to me as compared to other countries.
I had a similar situation flying out of DNR 9 years ago. The French NP officer neglected to stamp on the way in so I had to explain on the way out.