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Title:
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FORMAL GRAMMAR FOR THE NORMALIZATION OF RELATIVE TEMPORAL EXPRESSIONS |
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Author(s):
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Leandro Gallina, Renata Galante, Carina F. Dorneles |
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ISBN:
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978-989-8533-01-2 |
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Editors:
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Bebo White, Pedro Isaías and Flávia Maria Santoro |
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Year:
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2011 |
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Edition:
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Single |
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Keywords:
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Information retrieval, text analysis, formal grammars, and temporal expressions |
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Type:
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Full Paper |
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First Page:
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373 |
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Last Page:
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380 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Traditional search engines use only a small part of the Web's temporal information, and remain focused mostly on the page's publication date. In this scenario, an absolute temporal expression used as keyword query does not retrieve documents containing relative temporal expressions. In this paper, we propose an approach for normalizing relative temporal expressions in natural-language text. Our approach is based on a formal grammar to identify the temporal expressions and convert them to absolute dates. In order to demonstrate the effectiveness of our approach, we have executed a set of experiments over corpora of documents with relative temporal expressions. The evaluation shows successful results of precision (82.3%) and recall (80.2%) for our approach. |
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