Dublin Core Metadata Terms
Metadata vocabulary for describing resources. 15 core elements (title, creator, subject) expanded to dozens of terms.
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Where this one tends to earn its keep.
Library and archive cataloging standards
Digital asset management metadata
Web resource description and discovery
Cross-system metadata interoperability
CC-BY-4.0Derived from DCMI Metadata Terms, licensed under CC BY 4.0. Source: https://www.dublincore.org/specifications/dublin-core/dcmi-terms/
Verified against the licence text on 2026-08-07.
Others worth a look in Web Standards.