Understanding DOI (Digital Object Identifier) and Its Structure

What Is a DOI?

A DOI (Digital Object Identifier) is a unique, permanent identifier assigned to a work — such as a journal article, book, book chapter, conference proceeding, report, dissertation, dataset, or preprint — so that the work can be cited, linked, and discovered consistently, even if its original location (URL) changes over time.

DOI Structure

Every DOI follows this format: https://doi.org/[prefix]/[suffix]

• Prefix — issued by Crossref through a sponsor, in this case DOI by Pubmedia, and unique to each publisher/member.
• Suffix — defined by the publisher for each work, and should be opaque (not encoding information that may change).

Why Is a DOI Important?

• It guarantees a permanent link to scholarly work even if the publisher's website structure or address changes.
• It carries structured metadata that helps with the discoverability of the work across various databases and citation systems.
• It is an internationally recognized standard in scholarly publishing.

Important note: A DOI is permanent — once registered, the DOI string cannot be changed or deleted. Only the accompanying metadata can be updated.