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 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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