Y!A doesn't. Violations are all based on community self-policing these days. It's users who press the "report" button recklessly because they disagree with you, rather than any specific violation of the community guidelines. If you've had a question removed that you don't feel violated any of the guidelines, click the appeal link, and then follow up by posting on the violation appeals section of the forum (there's a link on the top right corner of the page). Be patient though, there's been a lot of abuse of the self-policing system since it took effect, and the appeals team is pretty swamped.