Digital object identifier

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**1. DOI System Overview and Functionality:**
– A DOI is a persistent identifier standardized by ISO.
– DOIs are used to identify academic, professional, and government information.
– DOI names remain fixed over time, while metadata can change.
– DOIs resolve to target information objects by binding to metadata.
– DOI system includes scholarly materials, research datasets, and official publications.
– DOI names can identify various levels of detail within objects.
– The DOI system combines the Handle System and the indecs Content Model.

**2. DOI Display and Resolution:**
– DOIs should display in the format doi:10.1000/182.
– CrossRef recommends displaying a persistent URL for DOIs.
– DOI names can be resolved using a DOI resolver like doi.org.
– Including DOIs as URLs allows users to click on them as normal hyperlinks.
– Alternative DOI resolvers like PANGAEA and doai.io have emerged.

**3. Administration and Growth of the DOI System:**
– The IDF is the developer and administrator of the DOI system.
– Organizations meeting contractual obligations can assign DOIs.
– Over 85 million DOI names had been assigned by 9,500 organizations by April 2013.
– Publishers are responsible for updating the DOI database to prevent dead links.
– The DOI system is implemented through a federation of registration agencies.

**4. Standardization and Registration Agencies:**
– DOI system is an international standard by ISO.
– Registration agencies appointed by IDF provide services to DOI registrants.
– DOI syntax is a NISO standard.
– Current RAs list is maintained by IDF.
– Registration agencies charge fees for assigning new DOI names.

**5. Importance and Benefits of DOIs:**
– DOIs provide a unique and persistent identifier for digital objects.
– DOIs ensure research outputs are findable, accessible, interoperable, and reusable.
– DOIs play a key role in establishing the credibility and impact of research.
– DOIs enhance discoverability and visibility of research outputs.
– Researchers can track the impact and usage of their work through DOIs.

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