DocBook is a Document Type Definition (DTD) for use with XML (the Extensible Markup Language) and SGML (the Standard Generalized Markup Language). DocBook lets authors technical groups exchange and reuse technical information. The emerging generation of Web browsers will be able to read and search XML documents; therefore authors will be able to create DocBook documents that function both as professionally produced hard copy books and as online documents available over the World Wide Web. This book contains an introduction to SGML, XML, and the DocBook DTD, plus the complete reference information for DocBook.