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Each suffix shall be unique to the prefix element that precedes it. The unique suffix can be a sequential number, or it might incorporate an identifier generated from or based on another system used by the registrant (for example, ISAN, ISBN, ISRC, ISSN, ISTC, ISNI; in such cases, a preferred construction for such a suffix can be specified, as in Example 2). No length limit is set to the suffix by the DOI System.
See also Defining a DOI Name Registration Policy.