| Abstract (2008) | |||||||||||||||
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| We study the expressiveness and performance of full-text search languages. Our main motivation is to provide a formal basis for comparing such languages and to develop a model for full-text search that can be tightly integrated with structured search. We develop a formal model for full-text search based on the positions of tokens (words) in the input text, and develop a full-text calculus (FTC) and a full-text algebra (FTA) with equivalent expressive power. This suggests a notion of completeness for full-text search languages and can be used as a basis for a study of their expressiveness. We show that existing full-text languages are incomplete and developCOMP, a complete full-text search language. We also identify practical subsets ofCOMP that are more powerful than existing languages, develop efficient query evaluation algorithms for these subsets, and study experimentally their performance. 1 | |||||||||||||||
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