article-types:conference-proceeding leaf node

@prefix article-types: <http://ns.nature.com/article-types/> .
@prefix npg: <http://ns.nature.com/terms/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

article-types:conference-proceeding a npg:ArticleType,
        skos:Concept ;
    npg:hasRoot article-types:research-and-reviews ;
    npg:id "conference-proceeding" ;
    npg:isLeaf true ;
    npg:isRoot false ;
    npg:treeDepth 2 ;
    rdfs:isDefinedBy article-types: ;
    skos:broader article-types:research ;
    skos:definition "The :conference-proceeding article-type denotes an article of original research published in the context of an academic conference."@en ;
    skos:inScheme article-types: ;
    skos:prefLabel "Conference Proceeding"@en .