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

2. 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

3. Query language Simple: –Key words Complex: –phrase matching, synonyms, weighted expressions, Boolean filtering, numeric (and dated) fields, document structure (fields), Form: –http://www.google.com Operators and rules –http://www.lemurproject.org/lemur/IndriQueryLanguage.php

4. Next Lecture: Text operations