Uniform dating tracking index

An ISSN, unlike the ISBN code, is an anonymous identifier associated with a serial title, containing no information as to the publisher or its location.

Conversely, as defined in ISO 3207, every serial in the ISSN system is also assigned a linking ISSN (ISSN-L), typically the same as the ISSN assigned to the serial in its first published medium, which links together all ISSNs assigned to the serial in every medium.Thus, the print and electronic media versions of a serial need separate ISSNs.Also, a CD-ROM version and a web version of a serial require different ISSNs since two different media are involved.However, the same ISSN can be used for different file formats (e.g. This "media-oriented identification" of serials made sense in the 1970s.In the 1990s and onward, with personal computers, better screens, and the Web, it makes sense to consider only content, independent of media.

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