Docmake is an automated builder from DocBook/XML to its output formats (e.g XHTML5 or PDF). It aims to be a saner replacement for xmlto.
( Note that xmlto’s development has stagnated somewhat right before the release of the first version of docmake. )
See:
To install use:
cpanm App::Docmake # Less preferable: cpan App::Docmake