This book is a collection of tutorial examples and notes written by the author while he was learning XSD (XML Schema Definition). Topics include: XSD (XML Schema Definition) specification and processors; JAXP (Java API for XML Processing) API; XSD Schema XML DOM/SAX validators; Using Xerces2 Java Parser API; XSD Built-in Datatypes: string, normalizedString, token, integer, long, int, short, byte, gYear, gMonth, gDay, gYearMonth, gMonthDay, duration, yearMonthDuration, dayTimeDuration, atomic, list, union; simpleContent and complexType; unique, key and keyref identity constraints; assert and assertion validation rules; Schema Component Reuse - include, redefine or import. Updated in 2024 (Version v5.23) with minor changes. For latest updates and free sample chapters, visit https://www.herongyang.com/XSD.