Abstract
Traditional knowledge organization systems (KOS) including thesauri, classification schemes, taxonomies, subject heading systems, name authorities, and other lists of terms and codes have been playing important roles in indexing, information organization, and retrieval. With the advent of the semantic web, a large number of them have been converted into Linked Open Data (LOD) datasets. Since the Simple Knowledge Organization Systems (SKOS) and SKOS eXtension for Labels (SKOS-XL) are languages for representation of knowledge organization systems, they have been applied to knowledge organization systems. In this article, the issues surrounding changes, versioning control, and evolution of KOS are investigated. From KOS services providers and consumers perspectives, this study focuses on representation of changes on the semantic web.
Highlights
The Simple Knowledge Organization System (SKOS) provides a common data model for organizing knowledge organization systems such as thesauri, classification schemes, subject headings, and taxonomies (W3C, 2012)
Since the Simple Knowledge Organization Systems (SKOS) and SKOS eXtension for Labels (SKOS-XL) became formal World Wide Web Consortium (W3C) recommendations, they have been applied to knowledge organization systems
From KOS services providers and consumers perspectives, this study focuses on the representation of changes on the semantic web
Summary
The Simple Knowledge Organization System (SKOS) provides a common data model for organizing knowledge organization systems such as thesauri, classification schemes, subject headings, and taxonomies (W3C, 2012). SKOS and SKOS-XL capture the common relations of KOS in a formal and explicit way. It potentially improves the interoperability between KOS. Changes need to be properly managed by KOS services providers and KOS consumers because an out-of-date or poorly managed KOS may provide obsolete information that may hinder information retrieval. KOS services providers often actively maintain their KOSs. For example, a thesaurus such as Arts and Architecture Thesaurus (AAT), subject heading systems such as Library of Congress Subject Headings (LCSH) 2 , Canadian Subject Headings (CSH) 3 and RVM (Répertoire de vedettesmatière) publish revisions regularly. With more and more KOSs being published on the semantic web, the issue of KOS changes needs to be investigated in this new context
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