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      You can of course buy and install a fully-fledged commercial XML 
editor with XSLT support, and run this application within it. However, this 
is beyond the reach of many users, so to do this unaided you just need to 
install three pieces of software: \emph{Java}\footnote{\url{http://java.sun.com/j2se/1.4.2/download.html}},
\emph{Saxon}\footnote{\url{http://saxon.sourceforge.net}}, and 
the DocBook 4.2 DTD\footnote{\url{http://www.docbook.org/xml/4.2/index.html}} 
(URIs are correct at the time of writing). None of these has a visual 
interface: they are run from the command-line in the same way as is possible 
with \LaTeX.
 
    
  
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