HTTP/2 200 date: Wed, 08 Oct 2025 18:17:18 GMT content-type: application/rdf+xml content-length: 56061 cf-ray: 98b7a25cabd47fa8-BLR last-modified: Fri, 14 Oct 2005 14:23:24 GMT etag: "dafd-4031799a98f00" cache-control: max-age=21600 expires: Thu, 09 Oct 2025 00:17:18 GMT vary: Origin, Accept-Encoding access-control-allow-origin: * x-backend: www-mirrors x-request-id: 98b7a25cabd47fa8 strict-transport-security: max-age=15552000; includeSubdomains; preload content-security-policy: frame-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests cf-cache-status: BYPASS accept-ranges: bytes set-cookie: __cf_bm=2fQxuUUc.1iLC9QKxP0_cxnJBRSB4A.Qt5D.8RwD3Oc-1759947438-1.0.1.1-f8TBmgOWsuVuN2GoiFY7Hfpov_3Ih.1kdi_UPtVfGKZs7zW5xdK9AE7SDV2MG5RZjUEffAX0e3dRVnCe58DSlbfLB166FlwDEbtfyc8X0L0; path=/; expires=Wed, 08-Oct-25 18:47:18 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None server: cloudflare alt-svc: h3=":443"; ma=86400 ]> SKOS Core Vocabulary 2005-03-31 'First W3C Public Working Draft' Edition The 2005-03-31 'First W3C Public Working Draft' edition of the SKOS Core Vocabulary. 2005-03-31 SKOS Core Vocabulary An RDF vocabulary for encoding simple concept schemes such as thesauri and subject heading lists. Alistair Miles Nikki Rogers Dave Beckett Members of the public-esw-thes@w3.org mailing list. 2005-03-31 Concept Scheme A set of concepts, optionally including statements about semantic relationships between those concepts. Thesauri, classification schemes, subject heading lists, taxonomies, terminologies, glossaries and other types of controlled vocabulary are all examples of concept schemes. A concept scheme may be defined to include concepts from different sources. testing 2004-03-26 2005-02-09 Definition modified from 'A description of a set of concepts, which may include a description of relationships between those concepts'. Comment added 'Thesauri, classification schemes, subject heading lists, taxonomies, terminologies, glossaries and other types of controlled vocabulary are all examples of concept schemes'. Change to bring in line with SKOS Core Guide and definition at Willpower Glossary. 2005-02-09 Alistair Miles Reworked the definition, in line with new guide. Concept scheme now defined as 'a *description* of a set of concepts, which may include a description of relationships between those concepts'. This change made to make explicit the fact that semantic relationships between concepts may be part of a concept scheme. Also expresses modelling concept scheme as an information resource (hence the 'description' word added). 2004-12-17 Alistair Miles Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles Concept An abstract idea or notion; a unit of thought. testing 2004-03-26 2004-12-17 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles Removed the comment about inferring the meaning of a resource of type skos:Concept, because it was misleading (move to intentional model, where properties of a concept *explain* the meaning of the concept, but do not determine it. This allows for clearer modelling of concepts in multiple schemes). 2004-12-17 Alistair Miles has top concept A top level concept in the concept scheme. testing This property replaces the deprecated skos:TopConcept class. 2004-08-19 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles in scheme A concept scheme in which the concept is included. A concept may be a member of more than one concept scheme. testing 2004-03-26 2005-03-22 Deprecated comment about rdfs:isDefinedBy because of mistaken understanding of relationship to that property. 2005-03-22 Alistair Miles Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles This property no longer a sub-property of rdfs:isDefinedBy. 2004-12-15 Alistair Miles preferred label The preferred lexical label for a resource, in a given language. No two concepts in the same concept scheme may have the same value for skos:prefLabel in a given language. testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles alternative label An alternative lexical label for a resource. Acronyms, abbreviations, spelling variants, and irregular plural/singular forms may be included among the alternative labels for a concept. Mis-spelled terms are normally included as hidden labels (see skos:hiddenLabel). testing 2004-03-26 2004-12-15 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles Changed comment to reflect addition of skos:hiddenLabel, which commonly used for spelling variants. 2004-12-15 Alistair Miles hidden label A lexical label for a resource that should be hidden when generating visual displays of the resource, but should still be accessible to free text search operations. unstable 2004-12-15 preferred symbol The preferred symbolic label for a resource. No two concepts in the same concept scheme may have the same value for skos:prefSymbol. testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles alternative symbol An alternative symbolic label for a resource. testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles semantic relation A concept related by meaning. This property should not be used directly, but as a super-property for all properties denoting a relationship of meaning between concepts. testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles has broader A concept that is more general in meaning. Broader concepts are typically rendered as parents in a concept hierarchy (tree). testing 2004-03-26 2005-03-31 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles Editorial: added missing inverse of to skos:narrower 2005-03-31 Alistair Miles CHANGE-TYPE-A has narrower A concept that is more specific in meaning. Narrower concepts are typically rendered as children in a concept hierarchy (tree). testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added new comment; added xml:lang value to label. 2004-10-20 Alistair Miles related to A concept with which there is an associative semantic relationship. testing 2004-03-26 2004-10-20 Added a definition; added an example; deprecated old comment; added xml:lang value to label. 2004-10-20 Alistair Miles Changed the definition to mention 'associative relationships', because previous definition too broad, and also to bring in line with BS8723 definition of 'associative relationships'. 2004-12-17 Alistair Miles public note A general note intended for public consumption. This property can be used directly for general notes, or as a super-property for more specific note types where the notes are intended for public consumption. unstable 2004-10-21 2005-03-31 Removed rdfs:comment as super-prop 2005-03-31 Alistair Miles CHANGE-TYPE-B private note A general note not intended for public consumption. This property can be used directly for general notes, or as a super-property for more specific note types where the notes are NOT intended for public consumption. unstable 2004-10-21 2005-03-31 Removed rdfs:comment as super-prop 2005-03-31 Alistair Miles CHANGE-TYPE-B definition A statement or formal explanation of the meaning of a concept. testing 2004-03-26 2004-10-21 Added a definition; added an example; deprecated old comment; added xml:lang value to label. 2004-10-20 Alistair Miles Domain of skos:Concept removed. Super-property changed from rdfs:comment to skos:publicNote. 2004-10-21 Alistair Miles scope note A note that helps to clarify the meaning of a concept. testing 2004-03-26 2004-10-21 Added a definition; added an example; deprecated old comment; added xml:lang value to label. 2004-10-20 Alistair Miles Domain of skos:Concept removed. Super-property changed from rdfs:comment to skos:publicNote. 2004-10-21 Alistair Miles example An example of the use of a concept. testing 2004-03-26 2004-10-21 Added a definition; added an example; deprecated old comment; added xml:lang value to label. 2004-10-20 Alistair Miles Domain of skos:Concept removed. Super-property changed from rdfs:comment to skos:publicNote. 2004-10-21 Alistair Miles history note A note about the past state/use/meaning of a concept. unstable 2004-10-21 editorial note A note for an editor, translator or maintainer of the vocabulary. unstable 2004-10-21 change note A note about a modification to a concept. unstable 2004-10-21 Collection A meaningful collection of concepts. Labelled collections can be used with collectable semantic relation properties e.g. skos:narrower, where you would like a set of concepts to be displayed under a 'node label' in the hierarchy. 2004-10-20 2004-12-17 The word 'meaningful' added to the definition. Small change to the comment to make it clearer. 2004-12-17 Alistair Miles unstable Ordered Collection An ordered collection of concepts, where both the grouping and the ordering are meaningful. Ordered collections can be used with collectable semantic relation properties, where you would like a set of concepts to be displayed in a specific order, and optionally under a 'node label'. 2004-10-20 2004-12-17 The text 'where both the grouping and the ordering are meaningful' added to the definition. 2004-12-17 Alistair Miles unstable Collectable Property A property which can be used with a skos:Collection. The following rule applies for this property: [(?x ?p ?c) (?c skos:member ?y) (?p rdf:type skos:CollectableProperty) implies (?x ?p ?y)] 2004-10-20 unstable member A member of a collection. 2004-10-20 unstable member list An RDF list containing the members of an ordered collection. The following rule applies for this property: [(?c skos:memberList ?l) elementOfList(?e,?l) implies (?c skos:member ?e)] 2004-10-20 unstable has subject A concept that is a subject of the resource. The following rule may be applied for this property: [(?d skos:subject ?x)(?x skos:broader ?y) implies (?d skos:subject ?y)] unstable 2004-10-22 2005-02-25 The domain of this property changed to be unconstrained (was previously foaf:Document). The definition altered to reflect this (s/document/resource). 2005-02-25 Alistair Miles is subject of A resource for which the concept is a subject. unstable 2004-10-22 2005-02-25 The range of this property changed to be unconstrained (was previously foaf:Document). The definition altered to reflect this (s/document/resource). 2005-02-25 Alistair Miles has primary subject A concept that is the primary subject of the resource. A resource may have only one primary subject per concept scheme. unstable 2004-10-22 2005-03-31 Editorial: s/document/resource in definition and comment 2005-03-31 Alistair Miles CHANGE-TYPE-A is primary subject of A resource for which the concept is the primary subject. unstable 2004-10-22 2005-03-31 Editorial: s/document/resource in definition 2005-03-31 Alistair Miles CHANGE-TYPE-A subject indicator A subject indicator for a concept. [The notion of 'subject indicator' is defined here with reference to the latest definition endorsed by the OASIS Published Subjects Technical Committee.] This property allows subject indicators to be used for concept identification in place of or in addition to directly assigned URIs. unstable 2004-11-11 Top Concept A concept that sits at the top of the concept hierarchy. unstable This class is now deprecated. To indicate that a concept is a top concept in a scheme, now use the skos:hasTopConcept property. 2004-03-26 2004-08-19 instance of An extension of the 'broader' property to specify the instantiation (instance of) relationship between two concepts. This property is semantically equivalent to the 'rdf:type' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ has instance This property is the inverse of the 'broaderInstantive' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ sub-class of An extension of the 'broader' property to specify the class subsumption (sub-class/super-class) relationship between two concepts. This property is semantically equivalent to the 'rdfs:subClassOf' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ super-class of This property is the inverse of the 'broaderGeneric' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ part of An extension of the 'broader' property to specify a partitive (part of) relationship between two concepts. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ has part This property is the inverse of the 'broaderPartitive' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ part of An extension of the 'related' property. Use this property to express a partitive relationship between concepts, where it is desired that such a relationship be treated as associative (i.e. linking separate branches of a hierarchy) and NOT hierarchical. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ has part This property is the inverse of the 'relatedPartOf' property. unstable 2004-03-26 2004-10-18 This term has been moved to the 'SKOS Extensions' vocabulary. See https://www.w3.org/2004/02/skos/extensions/ identifier Use or extend this property to indicate any non-URI code that is used to uniquely identify a concept within a conceptual scheme. unstable 2004-03-26 2004-10-20 This property is now deprecated. Use dc:identifier instead. This property deprecated. (Use dc:identifier instead.) Alistair Miles 2004-10-20