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{{short description|ISO standard unique string identifier for a digital object}} {{Self-reference|For the use of digital object identifiers on Wikipedia, see [[Wikipedia:Digital Object Identifier]].}}

…''ISSN''') is an eight-digit [[serial number]] used to [[unique identifier|uniquely identify]] a [[serial (publishing)|serial publication]], such as a magazi …ich may be zero through nine or an X, is a [[check digit]], so the ISSN is uniquely represented by its first seven digits. Formally, the general form of the

…rameters are: Article Type (MeSH terms, e.g., "Clinical Trial"), Secondary identifiers, (MeSH terms), Language, Country of the Journal or publication history (e-p Since July 2005, the MEDLINE article indexing process extracts identifiers from the article abstract and puts those in a field called Secondary Identi

{{Short description|Unique numeric book identifier since 1970}} …'') is a numeric commercial [[book]] [[identifier]] that is intended to be unique.{{efn|Occasionally, publishers erroneously assign an ISBN to more than one

…etadata]], medical [[Ontology (information science)|ontology]], and unique identifiers which enrich the [[XML]] structured data for each article.<ref>{{cite journ …MID]] is the bibliographic identifier for the [[PubMed]] database. The two identifiers are distinct however. It consists of "PMC" followed by a [[string (computer