DocBook is a DTD for computer documentation. It is suitable
to be used for both books and papers, and for both computer
software and hardware. This DTD was certified as an OASIS
Standard on 2 February 2001 after a vote of the OASIS membership.
Because it is a large and robust DTD, and because its main
structures correspond to the general notion of what constitutes
a "book"; DocBook has been adopted by a large and growing
community of authors writing books of all kinds. DocBook is
supported "out of the box" by a number of commercial tools,
and there is rapidly expanding support for it in a number
of free software environments. These features have combined
to make DocBook a generally easy to understand, widely useful,
and very popular DTD. Dozens of organizations are using DocBook
for millions of pages of documentation, in various print and
online formats, worldwide.