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XQuery for nonXML datatypes using generic programming

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XQuery for nonXML datatypes using generic. programming ... To enjoy the convenience and ease of use of XQuery with nonXML data. Example: which ...

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XQuery for nonXML datatypes using generic programmingPage 11/20Pi?XQuery for nonXML datatypes using genericprogrammingFermn Reig University of NottinghamPage 22/20Pi?MotivationTo enjoy the convenience and ease of use of XQuery with nonXML data. Example: whichbooks are cheaper in Amazon than in B&N?Page 32/20Pi?MotivationTo enjoy the convenience and ease of use of XQuery with nonXML data. Example: whichbooks are cheaper in Amazon than in B&N?let $am := document("http://www.amazon.com/books .xml")/BOOKS$bn := document("http://www.bn.com/books.xml ")/BOOKSfor $a in $am/BOOK$b in $bn/BOOKwhere $a/ISBN = $b/ISBNand $a/PRICE <= $b/PRICEreturn <BOOK>{ $a/TITLE $a/PRICE $b/PRICE </BOOK>Page 42/20Pi?MotivationTo enjoy the convenience and ease of use of XQuery with nonXML data. Example: whichbooks are cheaper in Amazon than in B&N?let $am := document("http://www.amazon.com/books .xml")/BOOKS$bn := document("http://www.bn.com/books.xml ")/BOOKSfor $a in $am/BOOK$b in $bn/BOOKwhere $a/ISBN = $b/ISBNand $a/PRICE <= $b/PRICEreturn <BOOK>{ $a/TITLE $a/PRICE $b/PRICE </BOOK>(Note: the types of Amazon and B&N books need not be the same. It suffices that both havesubcomponents named ISBN and price of compatible types.)Page 53/20Pi?Motivation (2)Reasons not to use XML as a representation of data include type safety and space usage.Page 63/20Pi?Motivation (2)Reasons not to use XML as a representation of data include type safety and space usage.data Xml tree =| Node Elem name Attribute] Xml tree]| Leaf StringDescription of the structure is repeated over and over in the data. Ex:Page 73/20Pi?Motivation (2)Reasons not to use XML as a representation of data include type safety and space usage.data Xml tree =| Node Elem name Attribute] Xml tree]| Leaf StringDescription of the structure is repeated over and over in the data. Ex:book = ("123456""Introduction to XML"30)xml book = Node "BO ...

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