XML Cont. XQuery language developed to query nested XML structures Not widely used currently SQL extensions to support XML ·Store XML data Generate XML data from relational data Extract data from XML data types Path expressions See Chapter 30(online)for more information Database System Concepts-7th Edition 8.11 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 8.11 ©Silberschatz, Korth and Sudarshan th Edition XML Cont. ▪ XQuery language developed to query nested XML structures • Not widely used currently ▪ SQL extensions to support XML • Store XML data • Generate XML data from relational data • Extract data from XML data types ▪ Path expressions ▪ See Chapter 30 (online) for more information