This chapter looks at a particular type of classification task, where the objects are text documents. A method of processing the documents for use by the classification algorithms given earlier in this book using a bag-of-words representation is described.
An important special case of text classification arises when the documents are web pages. The automatic classification of web pages is known as hypertext categorisation. The differences between standard text classification and hypertext categorisation are illustrated and issues relating to the latter are discussed.