(1) The marriage is concluded only if the parties contracting the marriage declare before the registrar that they wish to enter into the marriage. The registrar may not refuse to cooperate in the conclusion of the marriage if the prerequisites for concluding the marriage are met. The registrar must refuse to cooperate if
1. it is obvious that the marriage would be voidable under section 1314 (2), or
2. the marriage intended to be entered into would be ineffective pursuant to Article 13 (3) of the Introductory Act to the Civil Code (Einführungsgesetz zum Bürgerlichen Gesetzbuche) or the annulment of the marriage is an available option.
(2) A registrar includes a person who, without being a registrar, publicly exercised the office of a registrar and entered the marriage in the marriage register.
(3) A marriage also is deemed to have been concluded if the spouses have declared that they intend to be married to each other and
1. the registrar has entered the marriage in the marriage register,
2. the registrar, in the context of recording of the birth of a child of the spouses, has entered a reference to the marriage in the register of births, or
3. the registrar has received from the spouses a family-law declaration which requires an existing marriage in order to be valid and the spouses have been issued with a certificate in this regard that is provided in statutory provisions
and the spouses have lived together as spouses for 10 years since then or until the death of one of the spouses, but for a minimum of five years.