lecture10 - Semi-structured or Web-like Databases CS30785...

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Semi-structured or Web-like Databases CS30785 Lecture 10 – Core Query Language Dr. Gangmin Gary Li Department of CSSE XJTLU Gangmin.li@xjtlu.edu.cn Room: D441
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Previous lecture • Query language – the necessity • Desiderata of a XML query language • Path Expression L10-Core Query Language 10-2 CS30785 - Semistructured or Web-like databases
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Outlines • Core • Lorel • UnQL L10-Core Query Language 10-3 CS30785 - Semistructured or Web-like databases
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Review – Path expression Path expression represents a set of nodes. They are from the root and traverse the path specified by “.” L10-Core Query Language 10-4 CS30785 - Semistructured or Web-like databases
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Review – Path expression { “Combalusier”, “Roux”, “Smith”} L10-Core Query Language 10-5 CS30785 - Semistructured or Web-like databases
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Review – Path expression In general, the result of the path expression l 1 .l 2 ….l n on a data graph is the set of nodes V n Such that there exist edges ( r, l 1 , v 1 ), ( v
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This note was uploaded on 05/22/2011 for the course CS 30785 taught by Professor Garyli during the Spring '11 term at University of Liverpool.

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lecture10 - Semi-structured or Web-like Databases CS30785...

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