Chapter 21:Information Retrieval Relevance Ranking Using Terms Relevance Using Hyperlinks Synonyms.,Homonyms,and Ontologies Indexing of Documents Measuring Retrieval Effectiveness Web Search Engines Information Retrieval and Structured Data Directories Database System Concepts-6th Edition 21.2 @Silberschatz,Korth and SudarshanDatabase System Concepts - 6 21.2 ©Silberschatz, Korth and Sudarshan th Edition Chapter 21: Information Retrieval Relevance Ranking Using Terms Relevance Using Hyperlinks Synonyms., Homonyms, and Ontologies Indexing of Documents Measuring Retrieval Effectiveness Web Search Engines Information Retrieval and Structured Data Directories