DTDs for Internal IT Documents?

Saqib Ali asks: "A DTD (Documentation Type Definition) defines the document structure with a list of legal elements. DocBook DTD is being widely used in creating Linux related documentation. However I am looking for a XML DTD that is more suited to internal IT documentation, and easy to learn and use. Preferably I would like to use a DTD that can be used with OpenOffice. What DTDs are other Slashdot readers using for for internal IT documentation? I have created documentation using DocBook DTD and hosted them on a Apache Cocoon . Cocoon lets me transform the XML to HTML or PDF. I would like to keep the same backend infrastructure (i.e. Cocoon) but try out other DTDs that are suited for IT related documentation. Any ideas?"