4Thomas R. Gruber. Toward Principles for the Design of Ontologies Used for Knowledge Sharing [ OL]. http: ff citeseerx, ist. psu. edu/viewdoc/ download?doi = 10.1.1.89. 5775&rep = repl&type = pdf, 2013 - 07 - 25.
5Uschold M, King M. Towa:s a Methodology for Building Ontdogles [C]. hi: Workshop on Basic Ontological Issues in Knowledge Shar- ing, held in conjunction with IJCA 1 - 95, Montreal, Canada, 1995.
6Natalya F. Noy and Deborah L. McGuinness. Development 101 : A Guide to Creating Your First Ontology [OL]. http://wenku, baidu. eom/view/30tb4b956becO975f465e2bf, html , 2013 - 07 - 25.
7Noy N, Rector A. Defining N - ary Relations on the Semantic Web [OL]. http://www, w3. org/TR/swbp - n - aryRelations/, 2013 - 07-24.