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Polythematic Structured Subject Heading System
Polythematic Structured Subject Heading System (abbreviated as PSH from the Czech ''Polytematický Strukturovaný Heslář'') is a bilingual Czech–English controlled vocabulary of subject headings developed and maintained by the National Technical Library (the former State Technical Library) in Prague. It was designed for describing and searching information resources according to their subject. PSH contains more than 13,900 terms, which cover the main fields of human knowledge.
Thanks to its release in SKOS, PSH can be used not only for describing documents in a library, but also for indexing web pages. Everyone can use PSH for free. PSH is a part of the Linking Open Data cloud diagram (LOD cloud diagaram). The image of the LOD cloud diagram shows datasets that have been published in Linked Data format, by contributors to the (Linking Open Data ) community project and other individuals and organisations.
== History and development ==
The PSH preparation project started in 1993, supported by several grants from the Czech Ministry of Culture and Czech Ministry of Education, Youth and Sport. Since 1995, PSH has been used for indexing the State Technical Library’s documents. Starting 1997,〔KLOUČKOVÁ, Zdenka. Polytematický strukturovaný heslář Státní technické knihovny. Čtenář. 1997, vol. 49, no. 4, p. 128-129. ISSN 0011-2321.〕 PSH has been distributed to other libraries and companies, originally as a commercial, paid product; since 2009〔MYNARZ, Jindřich; KAMRÁDKOVÁ, Kateřina; KOŽUCHOVÁ, Kristýna. (Polythematic Structured Subject Heading System & Creative Commons ). In Seminář ke zpřístupňování šedé literatury (). 2008– (2010-05-28 ). Praha : Státní technická knihovna, 2008.〕 for free. In 2000, the State Technical Library received a grant from the Ministry of Culture to translate PSH into English. The next milestone in its development was its releasing in the SKOS format, in 2009.〔MYNARZ, Jindřich; KOŽUCHOVÁ, Kristýna; KAMRÁDKOVÁ, Kateřina. (Novinky z oblasti Polytematického strukturovaného hesláře ). Ikaros (). 2009, vol. 13, no. 7 (2010-05-28 ). URN-NBN:cz-ik5591. ISSN 1212-5075.〕
The vast majority of new subject headings is suggested and approved by the indexing experts from the National Technical Library. However, the users and public can also make suggestions, using an online form, which are then assessed by the experts. The main decisions about the development and the future of PSH are done by the Committee for Coordination of Polythematic Structured Subject Heading System. The Committee consists of specialists from the National Technical Library and cooperating institutions, and representatives from the libraries and companies which use PSH. The Committee meets once a year in the National Technical Library; in the meantime, the members communicate using an electronic mailing list.〔
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