14. Resource Identifier (M)


14.1. Cardinality


Occurrence: 1

14.2. Definition and Usage Instruction

The Identifier is a unique string that identifies a resource.

Usage Instruction

Recommended best practice is to identify the resource by means of a string or number conforming to a formal identification system. Example formal identification systems include the Uniform Resource Identifier (URI), the Uniform Resource Locator (URL), the Digital Object Identifier (DOI), and the URN:NBN. Also this can be a direct URL, or a redirection URL, like PURL, HANDLE or other international resolution mechanisms.

The ideal use of this element is to use a direct link or a link to a jump-off page (persistent URL) from identifier in the metadata record to the digital resource or a jump-off page.

Smart practice:

  • use a stable URL

Do Not Confuse With

  • Alternate Identifier (R) (Use datacite:alternativeIdentifier to list other identifiers than the primary identifier applied to the same resource.)
  • Related Identifier (R) (Use datacite:relatedIdentifier to refer to related resources.)
  • File Location (MA) (Use oaire:file to point to the resource being desccribed by this metadata, e.g. the fulltext file.)
  • Source (R) (Use dc:source for bibliographic citation of the originating resource.)

14.2.1. Property identifier (M, 1)

Use the identifier link as value.

14.2.2. Attribute identifierType (M)

The type of the Identifier (occurrences: 1).

Allowed values, examples, other constraints

Controlled list values

  • ARK
  • DOI
  • Handle
  • PURL
  • URL
  • URN


Unlike DataCite, OpenAIRE allows for DOIs and other types of identifiers.

14.3. Example

In this example the handle redirects to the jump-off page. A jump-off page is a good way to refer to. The end-user has the opportunity to see more information about the object(s) he has found, see the context and enjoy the other services a local repository has to offer:

<datacite:identifier identifierType="Handle">http://hdl.handle.net/1234/5628</datacite:identifier>