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. It is maintained by the DocBook Technical Committee of OASIS. This port contains DocBook 4.0 BETA 5. The DocBook documentation is available in ASCII and PDF at http://people.FreeBSD.org/~wosch/docbook/ WWW: http://www.oasis-open.org/docbook/