DocBook SGML specification allows publishers to mark up text content that will be used in traditional print or on the Web:. DocBook manual must examine and catalog the entirety of the DocBook specification and will be useful for anyone using SGML to publish the document. Using DocBook SGML to structure the contents of the book, identifying elements such as author, chapter, title, and so forth. (These are values that can be used to explain the custom content in DocBook documents.) Character entities, the code used to describe the diacritics and mathematical symbols, are also listed. Another useful section discusses the relationship between DocBook and XML, including the possibility of a fairly simple conversion for cross-translate the markup type. DocBook is a powerful way to distribute books, both in traditional print media and online Dragan. - Richard Topics covered: Fundamentals and DocBook SGML / XML, publishing books with DocBook; language style sheet: FOSIs, DSSSL, CSS, and XSL, DocBook reference element, attribute entities, the entity class; the same entity, the entity modules; local attribute entities; entities mix; module parameter entities; role attribute parameter entities, character entities, DocBook adapt, modify DocBook to XML.