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Any coherent text contains significant latent information, such as syntactic structure and patterns of language use. This information can be exploited to overcome the inadequacies of keyword-based retrieval and make information retrieval more effective. In this paper, we demonstrate quantitatively how syntactic information is useful in filtering out irrelevant documents. We also compare two different syntactic labelings -- simple Part-of-Speech (POS) labeling and Supertag labeling -- and show how the richer (more fine-grained) representation of supertags leads to more effective document filtering. We have implemented a system which exploits syntactic information in a flexible manner to filter documents. The system has been tested on a large collection of newswire sentences, and achieves recall and precision figures of 86% and 97% for filtering out irrelevant documents. Its performance and modularity makes it a promising postprocessing addition to any Information Retrieval system.

Using Syntactic Information in Document Filtering: A Comparative Study of Part-of-speech Tagging and Supertagging