XQuery Tutorial

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XQuery Tutorial



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What is XQuery?


XQuery is to XML what SQL is to databases.


XQuery is designed to query XML data.




XQuery Example



for $x in doc("books.xml")/bookstore/book

where $x/price>30

order by $x/title

return $x/title



What is XQuery?





XQuery
  • XQuery is the language for querying XML data

  • XQuery for XML is like SQL for databases

  • XQuery is built on XPath expressions

  • XQuery is supported by all major databases

  • XQuery is a W3C Recommendation

XQuery is About Querying XML


XQuery is a language for finding and extracting elements and attributes from XML
documents.


Here is an example of what XQuery could solve:


"Select all CD records with a price less than $10 from the CD collection
stored in cd_catalog.xml"


XQuery and XPath



XQuery 1.0 and XPath 2.0 share the same data model and support the same functions
and operators. If you have already studied XPath you will have no problems with
understanding XQuery.



XQuery - Examples of Use


XQuery can be used to:


  • Extract information to use in a Web Service

  • Generate summary reports

  • Transform XML data to XHTML

  • Search Web documents for relevant information

XQuery is a W3C Recommendation


XQuery is compatible with several W3C standards, such as XML, Namespaces,
XSLT, XPath, and XML Schema.


XQuery 1.0 became a W3C Recommendation in 2007.





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