1. A computer-implemented method for classifying an object in a taxonomy, the taxonomy including a plurality of nodes associated with a plurality of classes, the object being external to the taxonomy, the method comprising: (A) identifying a plurality of search strings based on a first plurality of class keywords associated with the plurality of nodes, wherein identifying comprises, for at least one particular node N in the plurality of nodes: (A)(1) traversing a first branch in the taxonomy linking a root node of the taxonomy to node N; and (A)(2) for each node M in the first branch, selecting a class keyword associated with node M and adding the selected class keyword to a first one of the plurality of search strings associated with node N, whereby the first one of the plurality of search strings contains a second plurality of class keywords; (B) using a search engine to perform a plurality of searches on the object using the plurality of search strings to produce a plurality of search scores corresponding to the plurality of search strings; (C) identifying one of the plurality of nodes based on the plurality of search scores; and (D) classifying the object in a class associated with the identified node.
8. The method of claim 1 , wherein the object comprises a document.