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Extra materials for this chapter are posted at http://www.nltk.org/, including links to freely available resources on the Web. For more examples of chunking with NLTK, please see the Chunking HOWTO at http://www.nltk.org/howto.
The popularity of chunking is due in great part to pioneering work by Abney, e.g., (Abney, 1996a). Abney’s Cass chunker is described in http://www.vinartus.net/spa/97a.pdf.