bibfirst-name.pptVIP

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bibfirst-name

References Lecture Slides Dan Suciu /homes/suciu/COURSES/590DS/06xpath.htm /homes/suciu/COURSES/590DS/14constraintkeys.htm BRICS XML Tutorial A. Moeller, M. Schwartzbach http://www.brics.dk/~amoeller/XML/index.html W3Cs XPath homepage /TR/xpath W3Cs XML Schema homepage /XML/Schema XML School * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * CSE 636 Data Integration XML Query Languages XPath /TR/xpath (11/99) Building block for other W3C standards: XSL Transformations (XSLT) XML Link (XLink) XML Pointer (XPointer) XQuery Was originally part of XSL XPath Example for XPath Queries bib book publisher Addison-Wesley /publisher author Serge Abiteboul /author author first-name Rick /first-name last-name Hull /last-name /author author Victor Vianu /author title Foundations of Databases /title year 1995 /year /book book price=“55” publisher Freeman /publisher author Jeffrey D. Ullman /author title Principles of Database and Knowledge Base Systems /title year 1998 /year /book /bib Data Model for XPath XML PI Element book Element publisher Element author Text Addison-Wesley Text Serge Abiteboul Comment Element book The root The root element … … Element bib / Document XPath: Simple Expressions /bib/book/year Result: year 1995 /year year 1998 /year /bib/paper/year Result: empty (there were no papers) XPath: Restricted Kleene Closure //author Result: author Serge Abiteboul /author author first-name Rick /first-name last-name Hull /last-name /author author Victor Vianu /author author Jeffrey D. Ullman /author /bib//first-name Result: first-name Rick /first-name XPath: Functions /bib/book/author/text() Result: Serge Abiteboul Jeffrey D. Ullman Rick Hull doesn’t appear because he has firstname, lastname Functions in XPath: text() = matches the text value node() = matches any node (= * or @* or text()) name() = returns the name of the current tag XPath: Wildcard //author/* Result

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