"The appeal body must be competent to deal with the sphere covered by these guidelines, in particular with: - the franchise and electoral registers; - the completion of popular initiatives and requests for referendums from a section of the electorate; - the procedural and, where applicable, substantive validity of texts submitted to a referendum: the review of the validity of texts should take place before the vote; domestic law determines whether such review is obligatory or optional; - respect for free suffrage: - the results of the ballot. "
CoE (Venice Commission): Code of Good Practice on Referendums, para. II.3.3.d

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Code of Good Practice on Referendums