This XML tutorial book is a collection of notes and sample codes written by the author while he was learning XML himself. Topics include introduction to XML, DTD (Document Type Definition), XSD (XML Schema Definition), XPath (XML Path Language), XSL (Extensible Stylesheet Language), XSLT (XSL Transformation), XSL-FO (Formatting Objects), DOM (Document Object Model), and SAX (Simple API for XML); viewing XML with Chrome, Firefox, Safari and IE Web browsers; XML tools with Notepad++ and Atom editors; generating and parsing XML with Java, PHP and Python programs; converting XML to and from JSON. Updated in 2024 (Version v5.25) with minor changes.For latest updates and free sample chapters, visit https://www.herongyang.com/XML.