The only formal membership requirement is the filing of an appropriate declaration of accession that serves as a statement of creed.

I might add that given the splendid explanation of the historic decisions, there was only one thing missing: the United Kingdom's immediate declaration of accession to monetary union.

East Germany's declaration of accession (Beitrittserklärung) included the East German territories into the field of application of the Basic Law.

Although one of the requirements set forth in the declaration of accession is to present your Identification Card it is of course possible to grant membership to a foreigner, especially one of Slavic descent.

On February 27, 1973, the Soviet Union deposited with the UNESCO its declaration of accession to the Geneva version of 1952 of the Universal Copyright Convention (UCC).