The logic of typed feature structures
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The application of morpho-syntactic language processing to effective phrase matching
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Approximately common patterns in shared-forests
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Formal Methods of Tokenization for Part-of-Speech Tagging
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Using Syntactic Dependency-Pairs Conflation to Improve Retrieval Performance in Spanish
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A Common Solution for Tokenization and Part-of-Speech Tagging
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Implementation of the SMART Information Retrieval System
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Syntagmatic and paradigmatic representations of term variation
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The SMART Retrieval System—Experiments in Automatic Document Processing
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Clustering Syntactic Positions with Similar Semantic Requirements
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Automatic phrase recognition and extraction from text
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Information Retrieval
Lexical and Syntactic knowledge for Information Retrieval
Information Processing and Management: an International Journal
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The performance of information retrieval systems is limited by the linguistic variation present in natural language texts. Word-level natural language processing techniques have been shown to be useful in reducing this variation. In this article, we summarize our work on the extension of these techniques for dealing with phrase-level variation in European languages, taking Spanish as a case in point. We propose the use of syntactic dependencies as complex index terms in an attempt to solve the problems deriving from both syntactic and morpho-syntactic variation and, in this way, to obtain more precise index terms. Such dependencies are obtained through a shallow parser based on cascades of finite-state transducers in order to reduce as far as possible the overhead due to this parsing process. The use of different sources of syntactic information, queries or documents, has been also studied, as has the restriction of the dependencies applied to those obtained from noun phrases. Our approaches have been tested using the CLEF corpus, obtaining consistent improvements with regard to classical word-level non-linguistic techniques. Results show, on the one hand, that syntactic information extracted from documents is more useful than that from queries. On the other hand, it has been demonstrated that by restricting dependencies to those corresponding to noun phrases, important reductions of storage and management costs can be achieved, albeit at the expense of a slight reduction in performance.