Link Search Menu Expand Document
Consortium of European Social Science Data Archives

ELSST Concept Scheme

ELSST is currently available as a SKOS-XL concept scheme. Concepts, their labels, relations and notes are the basic notions for an RDF / SKOS-XL concept scheme.

  • Concepts are ‘units of thought’ that exist in a domain. Concepts are represented by terms. In SKOS concepts are formalised as skos:concept, identified by dereferenceable URIs (URLs). In Skosmos, URIs are shown on each concept page.

  • Terms are the actual names used to refer to a concept. For example POLITICAL PROTEST, POLIITTINEN VASTARINTA, and POLITIČNI PROTEST are all labels for the same concept in English, Finnish and Slovenian, respectively.

    Labels are expressed by means of SKOS-XL predicates:

    • skosxl:prefLabel is used for ‘Preferred Terms’ in classical thesaurus terminology
    • skosxl:altLabel is used for ‘Non-Preferred’ or ‘Use For’ terms in classical thesaurus terminology.
  • Relations

    • Hierarchical relations between concepts are expressed in SKOS by the predicates skos:broader and skos:narrower, which correspond to the classical thesaurus relations Broader/NarrowerTerm (BT/NT).
    • Non-hierarchical relations express a notion of ‘relatedness’ between concepts and are represented in SKOS via the skos:related predicate, which corresponds to the classical thesaurus relation Related Term (RT).
  • Notes

    • Definitions are expressed as ‘skos:definition’
    • Scope Notes are expressed as ‘skos:scopeNote’
    • History Notes are expressed as ‘skos:historyNote’
    • Definition Sources are expressed as ‘xkos:additionalContentNote’

The table below shows the correspondence between SKOS(XL)/XKOS names, those used in Skosmos (see Using ELSST) and the previous ELSST Thesaurus Management System (TMS).

SKOS(XL)/XKOS Skosmos Previous ELSST TMS
skos:concept Concept Concept
skosxl:prefLabel Preferred term Preferred Term
skosxl:altLabel Entry term Use For term
skos:broader Broader concept Broader term
skos:narrower Narrower concept Narrower term
skos:related Related concept Related term
skos:definfition Definition Scope note
skos:scopeNote Scope note Use note
skos:historyNote History note History note
xkos:additionalContentNote Definition source Scope note source