There are several ways to customize output from the DITA Open Toolkit,
some of which are better or than others. The most comprehensive method is
to create a plug-in, which can do anything from modifying the presentation
of a single element, to adding support for a new DITA Specialization, to
creating an entirely new transform type. Plug-ins can likewise scale up from
a couple of 5 line XML files all the way to complex set of XSLT or Java
libraries.