(Yesterday’s beta in suite=minimals, OSX-Intel)
With
\setupbackend[export=example.xml,xhtml=example.xhtml,css=example.css]
in my project’s environment,
I get both example.xml and example.xhtml (as well as example-
images.css and example-style.css), starting with the same content
(up to line
I might not be able to help you with an automated output using context, but I
can recommend a very good book on e-book creation. Elizabeth Castro (ISBN
978-0321734686) discusses a sample e-book line by line of the source code, how
to create it, validate it (http://code.google.com/p/epubcheck/)