Editing Digital object identifier (section)

==Comparison with other identifier schemes==
A DOI name differs from commonly used Internet pointers to material, such as the [[Uniform Resource Locator]] (URL), in that it identifies an object itself as a [[first class (computing)|first-class entity]], rather than the specific place where the object is located at a certain time. It implements the [[Uniform Resource Identifier]] ([[Uniform Resource Name]]) concept and adds to it a data model and social infrastructure.<ref>{{cite web |title=DOI System and Internet Identifier Specifications |publisher=doi.org |date=18 May 2010 |url=https://doi.org/factsheets/DOIIdentifierSpecs.html |access-date=7 August 2010 |url-status=live |archive-url=https://web.archive.org/web/20100626072635/http://www.doi.org/factsheets/DOIIdentifierSpecs.html |archive-date=26 June 2010}}</ref>

A DOI name also differs from standard identifier registries such as the [[ISBN]], [[International Standard Recording Code|ISRC]], etc. The purpose of an identifier registry is to manage a given collection of identifiers, whereas the primary purpose of the DOI system is to make a collection of identifiers actionable and interoperable, where that collection can include identifiers from many other controlled collections.<ref>{{cite web |title=DOI System and standard identifier registries |publisher=doi.org |url=https://doi.org/factsheets/DOIIdentifiers.html |access-date=7 August 2010 |url-status=live |archive-url=https://web.archive.org/web/20100626071714/http://www.doi.org/factsheets/DOIIdentifiers.html |archive-date=26 June 2010}}</ref>

The DOI system offers persistent, [[semantic interoperability|semantically interoperable]] resolution to related current data and is best suited to material that will be used in services outside the direct control of the issuing assigner (e.g., public citation or managing content of value). It uses a managed registry (providing both social and technical infrastructure). It does not assume any specific business model for the provision of identifiers or services and enables other existing services to link to it in defined ways. Several approaches for making identifiers persistent have been proposed.

The comparison of persistent identifier approaches is difficult because they are not all doing the same thing. Imprecisely referring to a set of schemes as "identifiers" does not mean that they can be compared easily. Other "identifier systems" may be enabling technologies with low barriers to entry, providing an easy to use labeling mechanism that allows anyone to set up a new instance (examples include [[Persistent Uniform Resource Locator]] (PURL), URLs, [[Globally Unique Identifier]]s (GUIDs), etc.), but may lack some of the functionality of a registry-controlled scheme and will usually lack accompanying metadata in a controlled scheme.

The DOI system does not have this approach and should not be compared directly to such identifier schemes. Various applications using such enabling technologies with added features have been devised that meet some of the features offered by the DOI system for specific sectors (e.g., [[Archival Resource Key|ARK]]).

A DOI name does not depend on the object's location and, in this way, is similar to a [[Uniform Resource Name]] (URN) or PURL but differs from an ordinary URL. URLs are often used as substitute identifiers for documents on the Internet although the same document at two different locations has two URLs. By contrast, persistent identifiers such as DOI names identify objects as first class entities: two instances of the same object would have the same DOI name.