This document outlines rules for petitions for the declaration of absolute nullity of void marriages and annulment of voidable marriages in the Philippines. It discusses who can file petitions, where they must be filed, requirements for petitions, summons and answers, the role of public prosecutors in investigating collusion between parties, mandatory pre-trial procedures including briefs and conferences, prohibited matters for compromise, trial procedures, and requirements for memoranda. The goal is to provide a standard process for handling such petitions in a manner that prevents collusion and fabrication of evidence.