PDF version 1.4 & XeTeX

[Mojca M. <moj...@gm...>]

Hello,

I'm posting a bit weird question here. A user on the XeTeX mailing
list reported a problem, because XeTeX doesn't know how to interpret
PDF version 1.4 and thus he wasn't able to include a gnuplot-generated
(set term pdf) graph into his LaTeX document.

My question is: is version 1.4 needed for some reason (advanced
functionality, apart from smaller PDF files)? I.e: would it still work
if one decided to lower the PDF version to 1.3 for example and
recompiled gnuplot manually?

(x)dvipdfm(x) will have to be improved sooner or later, and there are
other means to help (lower the version with acrobat etc.), but I'm
just curious if there are means to lower the version from withing
gnuplot ...

Thanks a lot,
    Mojca