[Rd] Vignette without latex/sweave

[Gabor Grothendieck]

Is it possible to create a package vignette without latex/sweave?  I gather
that the %\VignetteIndexEntry and other \%Vignette... lines in the .Rnw 
file provide the various vignette metadata but was just wondering 
if latex/sweave are really hardwired into this or if its possible to 
produce a .pdf using other software and have it included as a vignette.  
If so, how does one specify the metadata?

I don't actually have a need for this but was just wondering.