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ch10 - Database System Concepts ©Silberschatz Korth and...

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Unformatted text preview: Database System Concepts ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use Chapter 10: XML Chapter 10: XML ©Silberschatz, Korth and Sudarshan 10.2 Database System Concepts - 5 th Edition, Aug 22, 2005. XML XML ■ Structure of XML Data ■ XML Document Schema ■ Querying and Transformation ■ Application Program Interfaces to XML ■ Storage of XML Data ■ XML Applications ©Silberschatz, Korth and Sudarshan 10.3 Database System Concepts - 5 th Edition, Aug 22, 2005. Introduction Introduction ■ XML: Extensible Markup Language ■ Defined by the WWW Consortium (W3C) ■ Derived from SGML (Standard Generalized Markup Language), but simpler to use than SGML ■ Documents have tags giving extra information about sections of the document ● E.g. <title> XML </title> <slide> Introduction …</slide> ■ Extensible , unlike HTML ● Users can add new tags, and separately specify how the tag should be handled for display ©Silberschatz, Korth and Sudarshan 10.4 Database System Concepts - 5 th Edition, Aug 22, 2005. XML Introduction (Cont.) XML Introduction (Cont.) ■ The ability to specify new tags, and to create nested tag structures make XML a great way to exchange data , not just documents. ● Much of the use of XML has been in data exchange applications, not as a replacement for HTML ■ Tags make data (relatively) self-documenting ● E.g. <bank> <account> <account_number> A-101 </account_number> <branch_name> Downtown </branch_name> <balance> 500 </balance> </account> <depositor> <account_number> A-101 </account_number> <customer_name> Johnson </customer_name> </depositor> </bank> ©Silberschatz, Korth and Sudarshan 10.5 Database System Concepts - 5 th Edition, Aug 22, 2005. XML: Motivation XML: Motivation ■ Data interchange is critical in today’s networked world ● Examples: Banking: funds transfer Order processing (especially inter-company orders) Scientific data – Chemistry: ChemML, … – Genetics: BSML (Bio-Sequence Markup Language), … ● Paper flow of information between organizations is being replaced by electronic flow of information ■ Each application area has its own set of standards for representing information ■ XML has become the basis for all new generation data interchange formats ©Silberschatz, Korth and Sudarshan...
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ch10 - Database System Concepts ©Silberschatz Korth and...

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