Re: Possible misstep regarding peg-revision support for externals definitions

C. Michael Pilato wrote:
...
> I mean, maybe the mapping is:
>
> local-path URL => old-style non-peg-revision-supporting syntax
> URL local-path => new-style peg-revision-supprting syntax
> relative-path relative-path => new-style peg-revision syntax with
> the first argument being a relative URL

As an aside, is the new syntax actually documented anywhere besides the
code and our heads? If not, where would be a good place to put it?
Will the book eventually grow some content on this?

-Hyrum