preferred label http://www.w3.org/2004/02/skos/core A resource has no more than one value of skos:prefLabel per language tag, and no more than one value of skos:prefLabel without language tag. The preferred lexical label for a resource, in a given language. The range of skos:prefLabel is the class of RDF plain literals. skos:prefLabel, skos:altLabel and skos:hiddenLabel are pairwise disjoint properties.