Object-Centered High-level REference Ontology
Abstract upper-level ontology for archaeological and cultural heritage data management and integration.
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Where this one tends to earn its keep.
Archaeological excavation data management
Cultural heritage research integration
Multi-project data harmonization
Historical artifact cataloging
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Foundational.