@inproceedings{kauppinen-et-al-extending-ci-2008,
  author = {Tomi Kauppinen and Heini Kuittinen and Jouni Tuominen and Katri Seppälä and Eero Hyvönen},
  title = {Extending an Ontology by Analyzing Annotation Co-occurrences in a Semantic Cultural Heritage Portal},
  booktitle = {Proceedings of the ASWC 2008 Workshop on Collective Intelligence (ASWC-CI 2008) organized as a part of the 3rd Asian Semantic Web Conference (ASWC 2008), Bangkok, Thailand},
  year = {2009},
  month =  {February 2-5},
  OPTpages = {},
  OPTnote = {http://www.hlt.nectec.or.th/ci08},
  OPTannote =    {semantic web,annotation,metadata,knowledge management,tag,collective intelligence},
  OPTproject =   {http://www.seco.hut.fi/projects/finnonto,http://www.seco.hut.fi/projects/smartmuseum,http://www.seco.hut.fi/projects/sw20,http://www.seco.tkk.fi/ontologies/yso/,http://www.seco.tkk.fi/applications/kulttuurisampo/,http://www.seco.tkk.fi/services/onki},
  abstract = {Ontologies aim to capture knowledge about things and their relationships. Publishing ontologies on the Semantic Web enables people and 
  organizations to use shared ontologies in annotating e.g. photographs, videos, music, and
  other types of cultural objects. Search engines also use relationships provided
  by ontologies in semantic search, e.g. for query expansion or for view-based
  search. However, building ontologies is a time-consuming process, and it should
  be helped by automatic finding of interesting, possible relationships. Finding the
  correct concept for annotation purposes is helped by subsumption and partonomy
  hierarchies and associative relationships. In this paper we show how an analysis
  of co-occurrences of concepts in annotations can be used to provide interesting
  relationships for enriching ontological structures. We use association rule mining techniques and test the idea using a set of annotations of cultural objects in
  CULTURESAMPO portal and the Finnish General Upper Ontology YSO. The results are visualized in the ONKI SKOS browser to give an additional layer on
  top of the original relationships of the YSO ontology. An analysis shows that
  best ranked relationships should also be included in the ontology as subclassof or
  associative relationships.
  }
}