linking to a locally installed epub file

[Patrice Dumas]

Hello,

Referring to another manual from within a manual (using @pxref and
similar), converted to the EPUB format, can be done as usual for HTML
following the HTML XREF specification, if there is an entry in an
htmlxref.cnf file.  When there is no entry in an htmlxref.cnf, however,
the generated link is bogus (and makes the EPUB invalid).

Even if there is an entry in htmlxref.cnf, it would also be nice to be
able to open a local epub file instead of going to the web HTML manual
(for now this would be at manual conversion time, if it could be
implemented).

I have not found anywhere information on how to link to an EPUB file
for these two use cases.  Do you know how to setup a link to an EPUB
file, and even to some content (an xhtml file in an EPUB container
and a #something target in the xhtml file)?  Maybe using an URL, but
other ways would be ok too.

Ultimately, that could allow to mimick what can be done in Info, or,
hopefully, in the future, in HTML for local browsing.

-- 
Pat