Quote

"Voting from abroad is subject to a number of practical conditions, beginning with registration on the electoral roll. Generally, a prior application is required from the citizen abroad (“active” registration system). In these cases, it is necessary to determine the deadline for citizens to register, the form required for this type of declaration and the authority to which these applications must be made. "

Document

CoE (Venice Commission): Report on Out-Of-Country Voting, para. 34

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Report on Out-Of-Country Voting

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Summaries

Limits on the right to vote may be based on residency.
Residency requirements should not be excessive, or may be considered discriminatory.
Limits placed on the right to vote must be based on objective and reasonable criteria.