DocBook is an SGML/XML DTD which is suitable for authoring technical documents, especially those about computer hardware and software. It is maintained and standardized by the DocBook Technical Committee at OASIS (originally SGML Open). DocBook originally started as an SGML DTD, but has an equivalent XML DTD starting with Version 4.
The DocBook DTD is widely used. Examples include the Linux Documentation Project, the GNOME and GTK+ API references, and the Linux kernel documentation. The Solaris Operating Environment manpages are generated from documents using a DTD based on DocBook.
Norman Walsh[?] and the DocBook Open Repository development team maintain a set of DSSSL and XSL stylesheets for generating print/PDF and HTML output from DocBook documents (as well as generating other formats, including man pages and HTML Help). Walsh is also the principal author of the book DocBook: The Definitive Guide, the official documentation of DocBook. This book is available online under the GFDL, and also as a print publication (ISBN 1565925807), published by O'Reilly & Associates.
