Digital Object Identifier (DOI)
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- It is assigned by the DOI System.
- See: Uniform Resource Locator.
- A DOI name - a digital identifier for any object of intellectual property. A DOI name provides a means of persistently identifying a piece of intellectual property on a digital network and associating it with related current data in a structured extensible way.
- (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Digital_object_identifier
- A digital object identifier (DOI) is a permanent digital identifier given to an object. Its most common application is identifying electronic documents. A DOI is not dependent on the object's location and, in this way, is similar to a Uniform Resource Name (URN) or Persistent Uniform Resource Locator (PURL) but differs from an ordinary Uniform Resource Locator (URL). 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." DOI is a registered trademark of the IDF.  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 is an implementation of the Corporation for National Research Initiatives's (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.
- DOI names use the indecs data dictionary, a semantic data dictionary. 
- (Paskin et al., 2003) ⇒ Norman Paskin, Eamonn Neylon, Tony Hammond, and Sam Sun. (2003). “The “doi URI Scheme for the Digital Object Identifier (DOI)." Internet-Draft: draft-paskin-doi-uri-04.txt
- In order to facilitate comparison of "doi" URIs and to reduce the risk of false negatives, normalization to the canonical form should be applied to minimize the amount of software processing for such comparisons.
- The following normalization steps should be applied:
- 1. Normalize the case of the leading "doi:" token to be lowercase
- 2. Unescape all unreserved %-escaped characters
- 3. Normalize the case of the scheme-specific part including any %-escaped characters to be uppercase
- The following forms of a "doi" URI
- 1. DOI:dk/P%C3%A6dagogi%2037(2),%20562
- 2. doi:DK/P%C3%A6dagogi%2037(2),%20562
- 3. doi:dk/P%c3%a6dagogi%2037(2),%20562
- 4. doi:dk/p%c3%a6dagogi%2037(2),%20562
- 5. doi:dk%2FP%C3%A6dagogi%2037%282%29%2C%20562
- are normalized to the canonical form