This directory contains rudimentary support for the notion of stylesheet templates. The idea is that if you want to change the behavior of the stylesheets, for example, processing different bibliography elements, you will construct a tempate document that describes what you want and then process that template with the "template" stylesheet. The result of this processing will be a customization layer for the DocBook XSL Stylesheets that does what you want. This removes the stylesheet customizer from the burdon of figuring out how the stylesheets work and modifying them. In theory, anyway...