MultiMarkdown is a lightweight markup language created by Fletcher T. Penney as an extension of the Markdown format. It supports additional features not available in plain Markdown syntax.
There is also a text editor with the same name that supports multiple export formats.
File format description
The MultiMarkdown language adds the following features to the basic Markdown specification:
footnotes
tables
citations and bibliography (works best in LaTeX using BibTeX)
math support
automatic cross-referencing ability
smart typography, with support for multiple languages
There are a series of open-source interactive and automated software tools for editing and conversion to XML, HTML, and LaTeX that share the same name as the format. Several other open-source and commercial text editors, such as Scrivener, also include broad MultiMarkdown support.
↑Leonard, Sean (March 2016). "Guidance on Markdown: Design Philosophies, Stability Strategies, and Select Registrations". Request for Comments: 7764. Internet Engineering Task Force. Retrieved 27 March 2022. This document elaborates upon the text/markdown media type for use with Markdown, a family of plain-text formatting syntaxes that optionally can be converted to formal markup languages such as HTML. Background information, local storage strategies, and additional syntax registrations are supplied.