Content
Definition: The ISSN is an eight-character code used to uniquely identify serial publications, such as journals, magazines, and newspapers. The last character is a check digit, which can be a digit or the letter “X”.
Format: The ISSN is usually formatted as two groups of four characters, separated by a hyphen (e.g., ISSN 0264-2875, ISSN 1365-201X).
In CELUS: CELUS uses ISSNs to identify and track serial publications. In COUNTER reports, this is the Print_ISSN. CELUS automatically corrects common formatting problems, such as a missing hyphen, extra spaces or missing leading zeros.
Definition: The eISSN is the ISSN assigned to the electronic (online) version of a serial publication. It is a regular ISSN; the “e” only indicates that it belongs to the online version.
Format: The eISSN is formatted the same way as the ISSN, with two groups of four characters separated by a hyphen (e.g., eISSN 1750-0095).
In CELUS: CELUS recognizes eISSNs (Online_ISSN in COUNTER reports) to manage and track the usage of electronic serial publications. This ensures that digital versions of journals and other periodicals are accurately monitored alongside their print counterparts.
Definition: The ISSN-L (linking ISSN) is a designated ISSN that links all media versions (print, online, etc.) of the same serial publication; each serial has exactly one ISSN-L. The ISSN-L is not a separate number: it is one of the serial’s existing ISSNs, usually the ISSN of the version registered first. It is designated by the ISSN Network (the ISSN International Centre and the national ISSN centres).
Format: The same as the ISSN (e.g., ISSN-L 0264-2875).
In CELUS: CELUS assigns an ISSN-L automatically based on the official ISSN–ISSN-L table published by the ISSN International Centre or, if the title is not there, based on one of the title’s own valid ISSNs. The ISSN-L is shown in reports and exports. When you upload a title list for tagging, the ISSNs and eISSNs in it are also matched against the ISSN-L of titles in CELUS.
Definition: The ISBN is a unique identifier for books, designed to simplify the distribution and purchase of books worldwide. It can be either 10 or 13 digits long.
Format:
In CELUS: CELUS recognizes ISBNs to track the usage of books. CELUS normalizes the harvested ISBNs by converting valid ISBN-10s to ISBN-13 and removing hyphens and spaces, so the same book is recognised whichever format the data uses.
Definition: A DOI is a persistent identifier assigned to a digital or physical object, most commonly a scholarly work such as a journal article, book, chapter, or dataset.
Format: A DOI starts with “10.”, followed by a prefix assigned to the registrant (e.g., a publisher), a slash, and a suffix chosen by the registrant (e.g., 10.1000/182).
In CELUS: CELUS recognizes DOIs provided in COUNTER reports and uses them, together with the other identifiers, to match titles. Prefixes such as “https://doi.org/” or “doi:” are removed automatically.
Definition: Proprietary IDs are unique identifiers assigned by specific publishers or platforms. These IDs are used internally by publishers to manage their content.
Format: The format of proprietary IDs varies depending on the publisher or platform. Unlike ISSNs and ISBNs, there is no standardized format.
In CELUS: CELUS can recognize and utilize proprietary IDs for tracking usage data. This flexibility allows CELUS to manage a wide range of e-resources, even if they do not have standard ISSN or ISBN identifiers. Because proprietary IDs are not standardized, CELUS uses them for matching only when standard identifiers are not available for comparison. They are compared without regard to letter case.
CELUS maintains its own title database. When usage reports are imported into CELUS, the software automatically associates the data for titles with titles from the database based on the following principles:
Note: the title name is part of the matching. If a provider reports the same ISSN under a different title name, CELUS records it as a separate title.
No. CELUS processes data for millions of titles, so title metadata is maintained automatically and cannot be edited by customers. CELUS can add missing identifiers from later data, but it does not change identifiers that are already stored.
When you upload a title list (e.g., for tagging), titles are matched by identifiers alone: ISSN, eISSN, ISBN, DOI, proprietary ID or the CELUS title ID. The title name is ignored. An ISSN or eISSN in the list matches any title whose ISSN, eISSN or ISSN-L has that value. Each identifier is looked up separately, so one row in the list can match more than one title.
