In modern Ruby, developers tend to write documents in RDoc instead of RD.
Although, the Japanese version of the Ruby Reference Manual still remains in RD format.
This document is syntactically correct RD, which attempts to follow the major conventions on section naming as well.
It includes text that is emphasized, keyboard, code-formatted, variable part, indexed, and as-is*1.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts.