Service description

The YSA is a general thesaurus in Finnish which covers all fields of research and knowledge, which contains the most common terms and geographical names used in content description.

In 2019 YSA has been replaced by the General Finnish Ontology YSO and its extension for place names YSO places.

Joining the service
  • Free of charge
Standards used

SFS 5471

Contact information
Service address
National Library
Background information

YSA has been used in databases since 1987.

Allärs is YSA's Swedish translation.

The General Finnish Ontology YSO has been developed on the basis of YSA.

Service users
  • Enterprises
  • Private individuals
  • Organisations

The thesaurus has been used mainly by libraries, archives and museums.

Steering responsibility

The National Library of Finland

Organisation model
  • Service is developed as part of basic operation of National Library
Index terms: