XML and XQuery

[Guest]

XML and XQuery



What is XQuery?
XQuery is to XML what SQL is to databases.
XQuery was 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.

XQuery Tutorial

You will learn a lot more about XQuery in our XQuery Tutorial.













★
+1

Reference: https://www.w3schools.com/xml/xml_xquery.asp