@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sco: <http://ontextract.org/sco#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

sco:ExtrinsicDrift a owl:Class ;
    rdfs:label "Extrinsic Drift" ;
    dcterms:bibliographicCitation "Gulla et al. (2010). Semantic Drift in Ontologies. WEBIST." ;
    rdfs:comment "Concept's semantic value changes relative to real-world phenomena it describes." ;
    rdfs:subClassOf sco:SemanticDrift ;
    skos:definition "Semantic drift wherein a concept's meaning shifts with respect to the external reality or phenomena it represents, potentially without internal ontology changes." ;
    skos:note "If whole ontology shows extrinsic but not intrinsic drift, indicates collective drift (domain evolved, ontology internally consistent)." .