By Peter Flynn of Silmaril Consultants and the University
of Cork (Ireland)
The PDF file for this excellent introduction is an example of
PDF made from LaTeX that was, in turn, generated by an XSLT
"style sheet" from XML document source prepared under a customized
version of the "DocBook" XML document type. More materials related
to this process may be found on CTAN: ftp://ftp.tex.ac.uk/tex-archive/info/beginlatex/.