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.