The DocBook DTD defines structural and content-based SGML markup for computer documentation, with a primary emphasis on software documentation and related classes of technical documents. Its main high-level hierarchical structures are for books, reference entries (for example, ``man pages''), and articles. This port contains DocBook 3.1 Nik Clayton nik@freebsd.org WWW: http://www.docbook.org/sgml/3.1/index.html