Gruber said he saw four different ways of adding meta-tags to material, ranging from the loosest to the most strict:
1.Folksonomy (informal, user-defined)
2.Controlled vocabularies (the user must deploy a set of defined terms)
3.Taxonomy (Pre-defined terms in which specific terms are subsets of more general terms)
4.Ontology (A rich set of relationships is mapped out among all the terms)
F. Suchanek, G. Kasneci, and G. Weikum. Proceedings of the 16th international conference on World Wide Web, page 697--706. New York, NY, USA, ACM, (2007)
F. Suchanek, G. Kasneci, and G. Weikum. Proceedings of the 16th International Conference on World Wide Web, page 697--706. New York, NY, USA, ACM, (2007)
F. Suchanek, G. Kasneci, and G. Weikum. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 697--706. New York, NY, USA, ACM Press, (2007)
F. Suchanek, G. Kasneci, and G. Weikum. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 697--706. New York, NY, USA, ACM Press, (2007)
J. Hoffart, F. Suchanek, K. Berberich, and G. Weikum. Research Report, MPI-I-2010-5-007. Max-Planck-Institut für Informatik, Stuhlsatzenhausweg 85, 66123 Saarbrücken, Germany, (November 2010)
T. Vitvar, J. Kopecky, J. Viskova, and D. Fensel. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (June 2008)
T. Vitvar, J. Kopecky, J. Viskova, and D. Fensel. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (June 2008)