The provisions as to the identification of author or publisher (art. 15) of the work, seizure of infringing works (art. 16) and domestic regulation and supervision (art. 17) are continued. The convention is applied (art. 18) to existing works, provided they have not fallen into the public domain in the country of origin or by expiration of the term in the country where protection is claimed. {Sidenote: National powers reserved} It is specially provided (art. 19) that the convention does not prevent "more favorable provisions" through domestic legislation "in favor of foreigners in general"; and the right of any country to make special treaties conferring more extended rights (art. 20) is continued. {Sidenote: Organization provisions} The provisions as to the International Bureau made in the Berne protocol are continued (arts. 21-23), and also those as to revision (art. 24) through conferences, to take place successively in the countries of the Union. Accession of other countries (art. 25) and colonies (art. 26) is to be made as heretofore, by notification through Switzerland, and it is provided that acceding countries may adhere to the present convention or those of 1886 or 1896. The present convention is made (art. 27) to replace the Berne convention of 1886 and the Paris acts of 1896, but it is specifically provided that the states signatory to the present convention may declare their intention to remain bound by specific provisions of previous conventions. The convention was to be ratified (art. 28) not later than July 1, 1910, and was to take effect (art. 29) three months thereafter, subject to withdrawal of any country by denunciation on one year's notice, in which case the convention would still remain in force for the other countries. It is specially provided (art. 30) that the states which introduce into their legislation the new term of protection shall notify the Swiss government accordingly, and any renouncements of reservations shall be similarly notified. {Sidenote: Ratification in 1910}