I'm not really getting it, aren't RFCs written in a straightforward Wiki syntax? Then why would they be preserved using PDF, and how is XML the source format, o

I'm not really getting it, aren't RFCs written in a straightforward Wiki syntax? Then why would they be preserved using PDF, and how is XML the source format, or would be considered useful as the canonical or authoring format when the existence of thousands of RFCs in plain text/light Wiki syntax clearly says otherwise?