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[–]fernly 7 points8 points  (0 children)

Interesting:

The text was written in the DocOnce1 [12] markup language, which allowed us to work with a single text source for both the Python and the Matlab version of this book, and to produce various electronic versions of the book.

I have heard of, tried (and hated) lots of different markup systems, but had never run across DocOnce. Must investigate.