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A digital object identifier (abbreviated DOI) is a permanent identifier given to an electronic document that, in contrast to a URL, is not dependent upon the electronic document\'s location. The International DOI Foundation (IDF) defines DOI name as "a digital identifier for any object of intellectual property"; it explains that the DOI is used for "persistently identifying a piece of intellectual property on a digital network and associating it with related current data in a structured extensible way."Frequently Asked Questions about the DOI® System DOI is a registered trademark of the IDF.Welcome to the DOI® System A typical use of a DOI is to give a scholarly paper or article a unique identifying number that anyone can use to obtain information about the publication\'s location on a digital network.
The DOI system uses the CNRI Handle System, a system for assigning names to objects for name resolution. DOIs are handles with the prefix "10."; handles for other namespaces in the Handle System have different prefixes. DOIs can be resolved at The DOI System and at The Handle System.
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A DOI differs from commonly used Internet pointers to material such as the URL because it identifies an object as a first-class entity, not simply the place where the object is located. A DOI also differs from identifiers such as (ISBNs, ISRCs, etc.) because it can be associated with defined services and is immediately actionable on a network.
A DOI can apply to any form of document expressed in any digital environment, including both physical and digital manifestations, performances and abstract works: DOIs can be used to identify e-texts, images, audio or video items, software, etc. An entity can be identified at any arbitrary level of granularity. This means that, for instance, DOIs can identify a journal, an individual issue of a journal, an individual article in the journal, or a single table in that article.
The DOI consists of a unique alphanumeric character string divided into two parts: a prefix and a suffix.
An example of a complete DOI is:
where:
The prefix is assigned by a DOI Registration Agency to a specific registrant. The suffix is assigned by the registrant and must be unique within a prefix. It can integrate existing standard identifiers such as an ISBN or ISSN, or SICI. The DOI is case insensitive and is considered an "opaque string": nothing can be inferred from the number with respect to its use in the DOI System.
The correct way to cite a DOI on a webpage or in a publication is doi:10.1000/182
DOI resolution redirects the user from a DOI to one or more pieces of typed data: URLs representing instances of the object, services such as e-mail, or one or more items of metadata.
"What the DOI identifies" and "what the DOI resolves to" are two different concepts: it is possible that a DOI does not resolve to the identified entity, but just to some related information wished by the publisher.
DOI resolution is provided through the Handle System technology, developed by the Corporation for National Research Initiatives, and is freely available to any user encountering a DOI. To resolve a DOI, just type in the address bar of any browser the string
followed by the DOI of the document.
For example, to resolve the DOI 10.1000/182, enter into your browser the address: http://dx.doi.org/10.1000/182. Of course, web pages or other hypertext documents can include hypertext links in this form, as in this sentence which links to the DOI Handbook. Some browsers allow the direct resolution of a DOI (or other handles) with an add-on (e.g. Mozilla)
There are several other ways to resolve a DOI, for example, one can use http://hdl.handle.net/ followed by the DOI of the document.
The DOI organization has applied for a "doi:" URI scheme to allow a DOI to be expressed as a Uniform Resource Identifier (URI) without requiring reference to a specific HTTP server as in the previous paragraph. As of April, 2006, this had not been approved. [1]
Each DOI is associated with a series of metadata, a set of bibliographical and commercial information concerning the content (title, author, publication date, copyright, price, etc.) and its position within the whole registrant\'s publishing offer (the belonging of a title to a series, of an article to a serial, the availability of one publication in more formats and/or through different media, etc.). By means of metadata, the DOI configures not simply as an identifying string, but takes the form of a powerful and unambiguous tool for data storage and exchange.
Metadata, as well as the DOI they are associated to, are persistently connected to the object they describe, so they can be easily communicated to other subjects across the productive and distributive chain, enhancing a content producer\'s ability to trade electronically. Furthermore, metadata represent the key for the development of DOI-based services, such as transnational databases and search engines for different kinds of contents. Asserting that metadata are persistent does not mean they are unmodifiable: registrants may update metadata about their contents any time they wish (whether some publication data change, when the primary URL the DOI resolves to is modified, etc.).
There are three main values granted by DOI adoption:
For publishers, there are some issues to consider before adopting the DOI:
The International DOI Foundation (IDF), a non-profit organisation created in 1998, is the governance body of the DOI System, which safeguards all intellectual property rights relating to the DOI System. IDF supports the development and promotion of the Digital Object Identifier system as a common infrastructure for managing content and ensuring the effective respect of copyright. The IDF works to ensure that any improvements made to the DOI system (including creation, maintenance, registration, resolution and policymaking of DOIs) are available to any DOI registrant, and that no third party licenses might reasonably be required to practice the DOI standard.
IDF is controlled by a Board elected by the members of the Foundation, with an appointed full-time Director who is responsible for co-ordinating and planning its activities. Through the elected Board, the activities of the Foundation are ultimately controlled by its members. Membership is open to all organizations with an interest in electronic publishing and related enabling technologies.
A DOI Registration Agency (RA) is an authority recognized by the IDF, whose primary role is to provide services to DOI registrants: allocating DOI prefixes, registering DOIs and providing the necessary infrastructure to allow registrants to declare and maintain metadata and state data. RAs are also expected actively to promote the widespread adoption of the DOI, to cooperate with the IDF in the development of the DOI System as a whole and to provide services on behalf of their specific user community.
Currently, eight major RAs are active worldwide, as listed at www.doi.org:
This article is licensed under the GNU Free Documentation License. It uses material from Wikipedia
