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    Cattuto, C., Benz, D., Hotho, A. & Stumme, G. Semantic Grounding of Tag Relatedness in Social Bookmarking Systems 2008
    Vol. 5318The Semantic Web -- ISWC 2008, Proc.Intl. Semantic Web Conference 2008, pp. 615-631 
    inproceedings DOI URL 
    Abstract: Collaborative tagging systems have nowadays become important data sources for populating semantic web applications. For taskslike synonym detection and discovery of concept hierarchies, many researchers introduced measures of tag similarity. Eventhough most of these measures appear very natural, their design often seems to be rather ad hoc, and the underlying assumptionson the notion of similarity are not made explicit. A more systematic characterization and validation of tag similarity interms of formal representations of knowledge is still lacking. Here we address this issue and analyze several measures oftag similarity: Each measure is computed on data from the social bookmarking system del.icio.us and a semantic grounding isprovided by mapping pairs of similar tags in the folksonomy to pairs of synsets in Wordnet, where we use validated measuresof semantic distance to characterize the semantic relation between the mapped tags. This exposes important features of theinvestigated similarity measures and indicates which ones are better suited in the context of a given semantic application.
      author = {Cattuto, Ciro and Benz, Dominik and Hotho, Andreas and Stumme, Gerd},
      title = {Semantic Grounding of Tag Relatedness in Social Bookmarking Systems},
      booktitle = {The Semantic Web -- ISWC 2008, Proc.Intl. Semantic Web Conference 2008},
      publisher = {Springer},
      year = {2008},
      volume = {5318},
      pages = {615--631},
      url = {http://www.kde.cs.uni-kassel.de/pub/pdf/cattuto2008semantica.pdf},
      doi = {http://dx.doi.org/10.1007/978-3-540-88564-1_39}

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