As I make (good) progress on my StructuredText parser, I'm beginning to look into other document formatting languages, like LaTeX and DocBook, so that I can get a feel for those languages' mindsets.[1]
Eventually I'd like to be able to have translators for StructuredText to HTML, LaTeX, DocBook, etc., so I'm beginning my education with those 
Here's the The Not So Short Introduction to LaTeX 2e (PDF)
Here's DocBook: The Definitive Guide, available to read online (DocBook sources available too
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Footnotes:
[1]: One question I have is, for instance: in languages other than HTML, are sub-lists considered part of a list item like they are in HTML?
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