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Ruby Document format
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<p>RD (Ruby Document) is a <a href="/facts/Lightweight_markup_language/2N0GJx5b">lightweight markup language</a> for writing <a href="/facts/Ruby_(programming_language)/BeYSaPSR">Ruby</a>-related documents. It can be embedded in Ruby source code. </p><p>RD is a traditional format. In modern Ruby, developers tend to write documents in <a href="/facts/RDoc/UaMq3NsY">RDoc</a> instead of RD. </p>