lecture2 - Semi-structured or Web-like Databases CS30785...

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Semi-structured or Web-like Databases CS30785 Lecture 2 Needs new Kind of Querying to WWW Dr. Gangmin Gary Li Department of CSSE XJTLU Gangmin.li@xjtlu.edu.cn Room: D441
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The Need of a New kind of Querying to WWW (WDB) • Why do we need it (by example) • How such a query system would work • What is the difference with the ordinary WWW query engines like Google, Baidu, etc. Dr.Gary Gangmin Li 2-2 CS-30785 Semistrucutred or Web-like databases
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Data types and Queries Dr.Gary Gangmin Li CS-30785 Semistrucutred or Web-like databases 2-3
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Data types and Queries Dr.Gary Gangmin Li CS-30785 Semistrucutred or Web-like databases 2-4
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Web data and the two cultures: Data base vs. Web Database Web More digital More text Rigid Relational Schemes Loosely defined, free text. Tables, records Arbitrary hyper-links Well developed query languages Some search engines with degree of returns Strongly distinguishes between abstract and implementation Less formal definition (semantic web ) Less redundant data
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lecture2 - Semi-structured or Web-like Databases CS30785...

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