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UMBEL (Upper Mapping and Binding Exchange Layer)
A lightweight, reference structure of 28,000 subject concepts for the Web. UMBEL is jointly developed and maintained by Structured Dynamics LLC and Ontotext AD. There is a total... -
AGROVOC
AGROVOC is a controlled vocabulary covering all areas of interest to the Food and Agriculture Organization of the UN (FAO). AGROVOC is available as and RDF - SKOS linked...