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Structure
The Universal Ontology is composed of a number of ontologies.
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Reference Data Universal ontology / W3C Time ontology
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The rationale behind this is that the separate ontologies may have different stewardships or have different change requirements.
The DCMI Metadata Terms ontology is defined by the Dublin Core Metadata Initiative, in the /terms/ namespace. It is independent, but the ISO/IEC 11179-3 Ontology depends on concepts established within it.
The ISO/IEC 11179-3 ontology is based on the schemas defined in Part 3 (Registry metamodel and basic attributes) of the International Organization for Standardization/International Electrotechnical Commission standard 11179 (Information technology - Metadata registries (MDR)). It is independent, but the Reference Data Universal Ontology depends on concepts established within it.
The Reference Data Universal Ontology can be used outside of the confines of the Core Universal Ontology, and edited according to different processes, and by different people. It is independent, but the Core Universal Ontology depends on concepts established within it.
The W3C Time ontology is defined by the World Wide Web Consortium. It is independent, but the Core Universal Ontology depends on concepts established within it.
The Core Universal Ontology is designed to be much less frequently changed than the Extended Universal Ontology.
The Extended Universal Ontology depends on the Core Universal Ontology.
Extensions of the Universal Ontology may build upon any Universal layer, depending on the use case.