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Variables petitioner and respondent provide detailed information about all parties, except the identity of the state if a state (or one of its subdivisions) is a party, petitioner and respondent variables note only whether a state is a party, not the state's name.
In a criminal case the prosecutor (from the District Attorney's office) is the plaintiff. The person charged with a crime is the defendant. In a civil case the plaintiff is the one filing the case against a defendant. In a civil case if the plaintiff does not show up without a good reason the case could be dismissed.