Re: one or two stylesheets to output html and pdf(fo)

i am thinking to start to incorporate pdf - documents in a web application.

So if the user click on the button pdf i want to display a pdf document
transformed from the same xml-source, from which my sytlesheet have had
generated the html page, he is using.

My question is what is better to code in aspects of easy to use,
optimization, loading time and maintenance, working with one stylesheet
using different namespaces to output these two kinds of display or  coding
two main separated stylesheets?

The usual approach is to use two different style sheets.
After all, you are adressing two different URLs.
Sometimes a pipelining approach as provided by Cocoon
can be an advantage: transform a bunch of documents
with a varying XML structure into an XML with some sort
of "display" structure and then transform this either
into HTML or XSLFO.