]> SKOS-Core 1.0 An RDF schema for encoding simple concept schemes such as thesauri, taxonomies and subject heading schemes. Alistair Miles Nikki Rogers Dave Beckett Concept-Scheme A concept scheme is any collection of concepts forming a coherent scheme, e.g. a thesaurus or a set of subject headings. Concept Use this class to indicate that a node is an abstract concept. The concept may be part of some conceptual scheme such as a thesaurus. in-scheme Use this property to state that a concept is a part of some concept scheme. A concept may be a part of more than one scheme. preferred-label Use this property to indicate a preferred label for a resource. If the resource is a concept in some conceptual scheme, then it is recommended that the preferred label be a unique label within that scheme. alternative-label Use this property to indicate an alternative (non-preferred) label for a resource. preferred-symbol Use this property to indicate a preferred symbolic representation for a resource. alternative-symbol Use this property to indicate an alternative (non-preferred) symbolic representation for a resource. external-identifier Use or extend this property to indicate any non-URI code that is used to uniquely identify a concept within a conceptual scheme. semantic-relation This is the super-property of all properties used to make statements about how concepts within the same conceptual scheme relate to each other. has-broader This property carries weak semantics. It may be used to state that the object is in some way more general in meaning than the subject. Essentially it provides a means of organising concepts into hierarchical structures, without being restrictive about the exact semantic implications of the hierarchical structure itself. Extend this property to create properties that carry stronger semantics, but may be reduced to a hierarchical structure for simple visual displays. has-narrower This property is the inverse of the 'broader' property. related-to This property carries weak semantics. It may be used to state that that the object is in some way related to the subject, and the nature of that relationship is NOT to be treated as hierarchical. Extend this property to create properties with stronger semantics, but may still be reduced to an associative structure for simple visual display. instance-of An extension of the 'broader' property to specify the instantiation relationship between two concepts. This property is semantically equivalent to the 'rdf:type' property. has-instance An extension of the 'narrower' property to specify the instantiation relationship between two concepts. sub-class-of An extension of the 'broader' property to specify the class subsumption relationship between two concepts. This property is semantically equivalent to the 'rdfs:subClassOf' property. super-class-of An extension of the 'narrower' property to specify the class subsumption relationship between two concepts. This property should be considered the inverse of 'broaderGeneric'. part-of An extension of the 'broader' property to specify a partitive relationship between two concepts. has-part An extension of the 'narrower' property to specify a partitive relationship between two concepts. This property should be considered to be the inverse of 'broaderPartitive'. 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 and NOT hierarchical. has-part An extension of the 'related' property. This property should be treated as the inverse of 'relatedPartOf'. related An extension of the 'related' property to be used where the relationship can be treated as being symmetric. scope-note A scope note is a piece of text that in some way helps to elucidate the intended meaning of a concept. definition A formal definition of the intended meaning of a concept. example A contextual example of the use of a concept, that helps to elucidate its intended meaning.