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, и G. Weikum. Proceedings of the 16th International Conference on World Wide Web, стр. 697--706. New York, NY, USA, ACM, (2007)
F. Suchanek, G. Kasneci, и G. Weikum. Proceedings of the 16th international conference on World Wide Web, стр. 697--706. New York, NY, USA, ACM, (2007)
F. Suchanek, G. Kasneci, и G. Weikum. WWW '07: Proceedings of the 16th international conference on World Wide Web, стр. 697--706. New York, NY, USA, ACM Press, (2007)
F. Suchanek, G. Kasneci, и G. Weikum. WWW '07: Proceedings of the 16th international conference on World Wide Web, стр. 697--706. New York, NY, USA, ACM Press, (2007)
J. Hoffart, F. Suchanek, K. Berberich, и G. Weikum. Research Report, MPI-I-2010-5-007. Max-Planck-Institut für Informatik, Stuhlsatzenhausweg 85, 66123 Saarbrücken, Germany, (ноября 2010)
T. Vitvar, J. Kopecky, J. Viskova, и D. Fensel. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (июня 2008)
T. Vitvar, J. Kopecky, J. Viskova, и D. Fensel. Proceedings of the 5th European Semantic Web Conference, Berlin, Heidelberg, Springer Verlag, (июня 2008)