How to build one package component only

Every package has a doc directory containing the documentation files. How do I build only that directory as a mini package? Reason: All Trinity documentation is contained in Docbook files. DocBook is a markup language. Quanta Plus and Kate provide no mechanism to view the final result because all Docbook files have to be converted to another form for viewing. As I revise the various docbook files, I want to regularly view the results in a Trinity desktop. I want to do this quickly without building an entire package. Side note: Basically, this is the beginning of a discussion about creating an efficient Docbook editing environment, which I'll post to the wiki. If you have any experience or interest in the development side of Docbook then please feel welcome to help. You don't have to write or edit, just help set up the environment and I'll document the process for everybody --- but I need help getting there. :) Thanks! Darrell