Free documentation using non-free preprocessor
What's the approach to documentation whose source code (preferred form
of modification) is only available in a format for which no free
For example, the Ada Reference Manual is written in a Scribe-like
language. ("Scribe" refers to the software by Brian Reid, not the
Debian package of that name, which implements an incompatible
formatting language.) There are only proprietary Scribe compilers.
However, the documentation is free, and its source code is available.
Can we can include open formats (such as HTML and Texinfo source)
generated from Scribe fiels in the main archive, at least? Even if
it's not the "real" source code?