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Mmark is a powerful markdown processor written in Go, geared towards writing IETF documents. It is, however, also suited for writing complete books and other technical documentation, like the Learning Go book (mmark source, and I-D text output.

It provides an advanced markdown dialect that processes file(s) to produce internet-drafts in XML RFC 7991 format. Mmark can produce xml2rfc (aforementioned RFC 7991), RFC 7749 (xml2rfc version 2) and HTML5 output.

Example RFCs in Mmark format can be found in the Github repository.

Mmark uses gomarkdown which is a fork of blackfriday.

If you like Go and parsing text, drop me (miek@miek.nl) a line if you want to be part of the Mmarkdown Github org, and help develop Mmark!


Mmark’s syntax and the extra features compared to plain Markdown are detailed in syntax.md.

Mmark adds the following syntax elements to gomarkdown/markdown:


You can download a binary or optionally build mmark your self. You’ll need a working Go environment, then check out the code and:

% go get && go build
% ./mmark -version

To output XML2RFC v3 xml just give it a markdown file and:

% ./mmark rfc/3514.md

Making a draft in text form (v3 output)

% ./mmark rfc/3514.md > x.xml
% xml2rfc --v3 --text x.xml

Making a draft in text form (v2 output)

% ./mmark -2 rfc/3514.md > x.xml
% xml2rfc --text x.xml

Outputting HTML5 is done with the -html switch. Outputting RFC 7749 is done with -2.

Example RFC

The rfc/ directory contains a couple of example RFCs that can be build via the v2 or v3 tool chain. The build the text files, just run:

cd rfc
make txt

For v2 (i.e. the current (2018) way of making RFC), just run:

cd rfc
make TWO="yes" txt

Official RFCs are in rfc/orig (so you can compare the text output from mmark).


kramdown-rfc2629 is an alternative markdown parser (written in Ruby) based on kramdown that has similar aims as Mmark.