Xquery Tutorial

Xquery TutorialCraig KnoblockUniversity of Southern California„„„„„„„„„„ReferencesXQuery 1.0: An XML Query Language www.w3.org/TR/xquery/XML Query Use Cases www.w3.org/TR/xmlquery-use-casesXquery Interpreter:http://prometheus2.isi.edu:9001/xquery.htmlAdvice: Case mattersWrite your queries incrementally!It is hard to debug entire queriesExample XML Document: bib.xml StevensW. Addison-Wesley 65.95 65.95 Example XML Document: bib.xml AbiteboulSergeBunemanPeterSuciuDan Morgan Kaufmann Publishers 39.95 GerbargDarcy CITI Kluwer Academic Publishers 129.95 „„„„„„Xquery OverviewXquery is an expression languageEvery statement evaluates to some resultlet $x := 5 let $y := 6 return 10*$x+$yEvaluates to 56Primitive typesNumber, boolean, ...