Intelligent Information Retrieval CS 336 –Lecture 2: Query Language Xiaoyan Li Spring 2006 Modified from Lisa Ballesteros’s slides

Query vs. Information need? Query: –a representation of user’s information need. –Input to IR systems. –Automatic or manually Information need –Descriptions – challenging –Questions --- QA

Query language Simple: –Key words Complex: –phrase matching, synonyms, weighted expressions, Boolean filtering, numeric (and dated) fields, document structure (fields), Form: – Operators and rules –

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