From Terminology Sandbox Wiki
URIs of the form "http://www.w3.org/1999/02/22-rdf-syntax-ns#Property%22 are not allowed.
Warning: Conflicting URIs
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Notes: Broader concepts are typically rendered as parents in a concept hierarchy (tree). By convention, skos:broader is only used to assert an immediate (i.e. direct) hierarchical link between two conceptual resources.