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XQuery

What is XQuery?

XQuery is a functional query language designed for querying XML data. It can extract and transform data from XML documents.

Basic Structure

for $variable in $sequence
let $anotherVariable := expression
where condition
order by $sortExpression
return expression

Example XQuery

Querying books with a price greater than 30:

for $book in doc("books.xml")/books/book
where $book/price > 30
return <result>
          <title>{$book/title/text()}</title>
          <author>{$book/author/text()}</author>
       </result>

Conclusion

• XSLT: Transforms XML into other formats.
• XPath: Navigates XML documents and selects nodes.
• XQuery: Queries and manipulates XML data.

These technologies are powerful tools for working with XML, and understanding their fundamentals can greatly enhance your ability to process and utilize XML data. If you have any questions or need further clarification, feel free to ask!