lecture3 - Semi-structured or Web-like Databases CS30785...

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Semi-structured or Web-like Databases CS30785 Lecture 3 – HF Set Dr. Gangmin Gary Li Department of CSSE XJTLU Gangmin.li@xjtlu.edu.cn Room: D441
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Summary of we have learnt so far • WWW can be viewed as Semistructured Databases, any web application can be viewed as a Query to this DB • A web pages has a unique URL and several hyper-links to other urls. • A web page can be presented as a Graph consists of urls as its vertices and labels as its edges Dr. Gary Gangmin Li CS30785 - Semistructured or Web-like databases 3-2
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Summary of lecture 2 • Needs of new way of query WDB • The new way has four major steps: – Browsing, – Searching, – Composing, and – Publishing Dr. Gary Gangmin Li CS30785 - Semistructured or Web-like databases 3-3
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3-4 Outline • Three presentations, query and their conversions – Set theory on WDB – RDB – Graph • Any database state can be expressed by a HF-set • Query on RDB and queries on HF-set (state transformation) • Transformation in Graph Dr. Gary Gangmin Li CS30785 - Semistructured or Web-like databases
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Dr. Gary Gangmin Li 3-5 CS30785 - Semistructured or Web-like databases
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lecture3 - Semi-structured or Web-like Databases CS30785...

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