Explainer · Plain-language
Dublin Core Metadata: Definition, Meaning & Examples | CASRAI
Dublin Core is a set of fifteen core metadata elements used to describe digital and physical resources. It is widely adopted across digital libraries, institutional repositories, and search engines to support interoperable resource discovery.
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The fifteen core elements
The core elements are Title, Creator, Subject, Description, Publisher, Contributor, Date, Type, Format, Identifier, Source, Language, Relation, Coverage, and Rights. These are all optional and repeatable, meaning a cataloguer can use as few or as many as needed, and repeat any field (such as having multiple Creators).
Simple versus Qualified Dublin Core
Simple Dublin Core uses only the core fifteen elements without further qualification. Qualified Dublin Core introduces elements refinements (which make an element's meaning narrower or more specific) and encoding schemes (which identify controlled vocabularies or formal rules, such as using the W3C Date format).
Role in modern repositories and open science
Nearly every institutional repository software — including DSpace, EPrints, and Islandora — supports Dublin Core natively. By exposing Dublin Core records through the OAI-PMH protocol, universities and publishers make their content crawlable by aggregators like OpenAIRE and Google Scholar, ensuring global discovery of scholarly outputs.
Key facts
At a glance
- Definition: A fifteen-element metadata standard for resource description
- Established: 1995 at a metadata workshop in Dublin, Ohio
- Core elements: Title, Creator, Subject, Date, Format, Identifier, and more
- Versions: Simple (15 elements) and Qualified (adds refinements)
- Key benefit: Enables seamless open-science indexing and discovery
- Standard: Governed by ISO 15836 and NISO Z39.85
Common misconceptions
What people often get wrong
Often heard: Dublin Core is only for digital files or web pages.
Actually: No — Dublin Core was designed to describe any resource, digital or physical, including books, artworks, museum specimens, datasets, and software.
Often heard: All fifteen elements must be completed for every record.
Actually: No — all Dublin Core elements are optional and repeatable. A valid record can contain just three elements, or five, depending on cataloguing needs.
Going deeper
