I'd like to take a look at the sources for some of the LaTeX3 development to model after, but I'm having trouble finding them. Where might I find the sources for
texdoc xparse, and the like?
As with any other material in TeX Live, the sources are available inside the
source tree. You can find them by using
kpsewhich with the appropriate
.dtx file name, thus for example
kpsewhich xparse.dtx will give
In the case of
source3, life is a bit more complex as this is constructed from all of the
.dtx files for
l3kernel. There are a few
.tex files which do this, and these are currently uploaded in the
doc subtree, so inside
As David mentions in a comment, you can access the SVN repository via the team website, or the (perhaps nicer) GitHub mirror if you are willing to risk being a few commits behind the burning edge (synch is currently once-per-hour with the SVN on a script running on the latter server).