Re: [PATCH] Documentation: fix build with Asciidoctor 2

> There are a couple ways around this.
>
> 1. We can force xmlto to use the DocBook 5 stylesheets with the "-x"
> flag, but we have to know where they are.  Debian and Fedora have them
> in different places, so we'd need a knob to figure out where they are.
>
> 2. We can force xmlto to use a custom stylesheet with "-x" that merely
> imports the DocBook 5 stylesheets using a URL.  If the user has the
> DocBook 5 stylesheets installed and XML catalogs configured (the default
> on Linux distributions), then everything will just work and the system
> will resolve it to the local copy.  If, however, things are not properly
> configured, this will result in multiple network downloads for each
> manual page.
>
> 3. We can give up on xmlto and do things ourselves.  This has the same
> problem as option 1, since we need to learn how to find the stylesheets.
>
> 4. We can send a patch to xmlto to make it use the proper stylesheets
> for DocBook 5 and hope upstream does a release and everyone upgrades
> shortly.  Since xmlto is not at all active upstream, this seems like it
> may be an imprudent choice.
>
> 5. We can send a patch to the DocBook stylesheets and have them include
> both the namespaced and unnamespaced versions of the element names in
> both sets of stylesheets and hope everyone upgrades.
>
> My personal preference is #2; I think that seems like the best choice
> forward.  XML catalogs are well understood and well configured on Linux
> distributions.  Homebrew supports them adequately, but you have to add
> an environment variable to your shell configuration to enable them.  Of
> course, if you're doing _anything_ with XML, you'll have them enabled.