YouTipXQuery Introduction
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XQuery Tutorial
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XQuery Introduction
The best way to explain XQuery is to say that XQuery's relationship to XML is similar to SQL's relationship to database tables.
XQuery is designed to query XML data - not just XML files, but any data that can be presented in XML form, including databases.
Prerequisites:
Before you continue, you should have a basic understanding of the following:
- HTML / XHTML
- XML / XML Namespaces
- XPath
If you want to learn these topics first, visit our home page for tutorials.
What is XQuery?
- XQuery is a language used for querying XML data.
- XQuery works on XML like SQL works on database tables.
- XQuery is built on top of XPath expressions.
- XQuery is supported by all major database engines (IBM, Oracle, Microsoft, etc.).
- XQuery is a W3C standard.
XQuery and XML Query
XQuery is a language used to find and extract elements and attributes from XML documents.
This is an example of an XQuery problem being solved:
"Select all CD records from the CD collection stored in an XML document named cd_catalog.xml where the price is less than 10 dollars."
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 learned XPath, learning XQuery will be easy.
You can read more about XPath in our XPath Tutorial.
XQuery - Application Examples
XQuery can be used for:
- Extracting information for use in web services.
- Generating summary reports.
- Converting XML data into XHTML.
- Searching web documents for relevant information.
XQuery is a W3C Recommendation Standard
XQuery is compatible with various W3C standards, such as XML, Namespaces, XSLT, XPath, and XML Schema.
XQuery 1.0 was established as a W3C Recommendation Standard on January 23, 2007.
For more information about W3C's XQuery activities, read our W3C Tutorial.
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