2.10 XQuery

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XQuery is a powerful query and functional programming language designed for querying and transforming XML data. Below are some key features and concepts associated with XQuery:

Key Features

1. XML Data Handling: XQuery is specifically designed to work with XML data, allowing you to extract and manipulate XML content efficiently.

2. XPath Integration: It uses XPath, a language for navigating XML documents, to select nodes and perform operations on them.

3. Functional Programming: XQuery supports functional programming constructs, allowing for more expressive and compact code.

4. Data Transformation: You can transform XML data into other formats, such as HTML or plain text.

5. Database Interaction: XQuery can be used to query XML databases directly, making it suitable for applications that rely heavily on XML data storage.

Basic Syntax

Here's a simple example of an XQuery expression:

for $book in doc("books.xml")//book
where $book/price < 20
return $book/title

Components

• FLWOR Expressions: The for, let, where, and return clauses form the basis of most XQuery expressions.
• Functions: You can define and call functions to encapsulate reusable logic.

Use Cases

• Data Extraction: Retrieve specific information from XML documents.
• Data Transformation: Convert XML data into other formats or structures.
• Web Services: Interact with XML-based web services.

If you have specific questions or need examples, feel free to ask!