md output format

Outputs Markdown to a .md file.

The portable common subset of OurBigBook headers, paragraphs, emphasis, links, images, code, quotes, lists, horizontal rules, mathematics and tables is converted to the closest Markdown construct.

For example:

Markdown output is generally viewed as a downgrade of data structures, since markdown is a subset of OurBigBook. One major use case is to publish directly GitHub, thus treating the markdown as an output entirely.