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A general description is here.
Sweave now outputs ‘.tex’ files in UTF-8 if the input encoding is declared to be UTF-8, regardless of the local encoding. The UTF-8 encoding may now be declared using a LaTeX comment containing the string ‘%\SweaveUTF8’ on a line by itself.
The HTML version of ‘An Introduction to R’ now has links to PNG versions of the figures.
There is experimental support to produce manuals in ebook formats. (See ‘doc/manual/Makefile’.)