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A thesaurus is a structured vocabulary that shows basic relationships between concepts: hierarchical, associative, and equivalence. Users of a thesaurus not only will find terms that are broader and narrower than others, but also terms that are synonymous, antonymous, or otherwise related (associated) in a defined manner.

DescribesConcepts (content) and the relationships between them (structure), including axioms and restrictionsHierarchical relationships among concepts, and specifies the term to be used to refer to eachHierarchical and non-hierarchical relationships among conceptsGeneral term for a collection of concepts (words) to do with a domain
RelationshipsTyped hierarchical and associativeBasically hierarchical, but all modeled using same notationUntyped hierarchical, associative, and equivalenceUnspecified (abstract concept)
PropertiesRDFS defines relationship properties and restrictionsNoneCan be described in scope notes if requiredUnspecified (abstract concept)
StructuredNetworkTreeCross-branch treeUnspecified (abstract concept)


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