This piece is based on two talks I gave in the spring of 2005 -- one at the O'Reilly ETech conference in March, entitled "Ontology Is Overrated", and one at the IMCExpo in April entitled "Folksonomies & Tags: The rise of user-developed classification." Th
D. Yellin. Reprint of PhD thesis, Department of Comp. Sc., Columbia University,
New York, NY, том 302. Springer-Verlag, New York--Heidelberg--Berlin, (1988)