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数据库管理系统:ch10 XML.ppt
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数据库管理系统:ch10 XML.ppt
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©Silberschatz, Korth and Sudarshan10.2Database 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 Sudarshan10.3Database 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 Sudarshan10.4Database 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 Sudarshan10.5Database 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
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