Polythematic Structured Subject Heading System (PSH)

PSH logo

What is PSH?

Polythematic Structured Subject Heading System (PSH) is a bilingual Czech–English controlled vocabulary of subject headings which is used for organizing and searching the documents by subject. It is developed and maintained at the National Library of Technology of Prague. PSH contains over 13 900 subject headings in its latest version (PSH 3.0) and is divided into 44 thematic sections which cover the main fields of human knowledge. Each subject heading is included in a hierarchy of six (or - under special circumstances - seven) levels according to its semantic content and specificity. The whole system is a tree structure and it represents various concepts from the most general to more specific ones. There are hierarchical, associative and equivalence relations in PSH.

In what formats is PSH available?

PSH is available in a MARC 21 Format for Authority Data which is used for storage, maintenance and sharing PSH in library automated systems. PSH is also available in SKOS (Simple Knowledge Organization System), using RDF/XML syntax, which is suitable for the web distribution. Single subject headings can be accessed on the PSH website through URI links. Alternatively, the whole vocabulary can be downloaded in one file.

How is PSH licensed?

PSH/SKOS is available under the Creative Commons License CC BY-SA 3.0 Czech Republic (Attribution-ShareAlike 3.0). That means you are free to copy, distribute, display and perform the work and make derivative works, but you also must give the original author credit and if you alter, transform, or build upon this work, you may distribute the resulting work only under a licence identical to this one.

How can I browse PSH?

There are two main tools for browsing PSH (both developed at the National Library of Technology of Prague) - PSH Browser and PSH Manager.

PSH Browser is a tool that navigates the users through PSH from general to more specific terms. Users can also use the Search field. It is possible to display tags from PSH (metadata snippets – Dublin Core and CommonTag), which can be embedded in an HTML document to provide its semantic description in a machine-readable way.

PSH Manager, on the other hand, serves mostly to catalogers and PSH developers.

PSH is also integrated in the National Library of Technology's on-line catalogue of documents, the website of the Czech Technical University in Prague and the STM Portal´s on-line catalogue.

How can I contact the PSH developers?

In case you have a question, you can contact the PSH office via e-mail which is psh (@) techlib.cz.

PSH history in a nutshell

1993 - work on the subject heading system started, these activities were supported by several grants provided by the Ministry of Culture of the Czech Republic and the Ministry of Education, Youth and Sports of the Czech Republic

1997 - PSH was distributed to all interested parties - libraries and commercial companies

2000 - PSH Version 1.3 was distributed

2000 - in April the State Library of Technology received financial support from the Ministry of Culture of the Czech Republic to translate PSH into the English language. PSH Version 1.4 is therefore bilingual.

2001 - PSH Version 1.4 was distributed. Based on the decision of the Ministry of Culture of the Czech Republic, the subject heading system was offered to public libraries for free and to commercial companies for fee. It was provided as a TXT file in which the order of the subject headings indicated the hierarchical structure. Each row contained a subject heading in Czech and in English, both accompanied by relevant references. Modified freeware which could link Czech and English subject headings and offered search capabilities was a part of the package.

2002 - a special maintenance module for the subject heading system was commissioned by the State Library of Technology from KP-Sys (a company producing automated library systems). Revision of PSH Version 1.4. began.

2005 - PSH Version 2.0 was completed but due to a number of shortcomings it was not distributed to users

2006 - large-scale corrections of PSH Version 2.0 took place and a new version (2.1) was introduced

2006 - in November PSH in its latest version (2.1) was implemented to Aleph, an automated library system currently used at the State Library of Technology (note: "State Library of Technology" has been renamed to "National Library of Technology" in 2009)

2009 - PSH was published in a SKOS format

2010 - the latest version PSH 3.0 was released


Odpovědná osoba: Tereza Nádějová
Poslední změna: 27.6. 2013 17:06  
Kontakt na odpovědnou osobu: +420 232 002 544, tereza.nadejova@techlib.cz