Markdown and the markup language used by Wikipedia are examples of such wiki markup. Markdown is a lightweight markup language with plain-text-formatting syntax. It supports compiling from various markup languages, including Markdown, Textile, and Haml. RDoc supports four markup languages, RDoc Markup, Markdown, tomdoc, and rdtool. MultiMarkdown is a lightweight markup language created by Fletcher T. Penney and based on Markdown. Textile is one of several lightweight markup languages to have influenced the development of Markdown. Instead of WYSIWYG, the platform uses Markdown for formatting. This is also the format the Markdown formatter uses to indicate code. Each article is represented as a Markdown file in various GitHub repositories. Discord provides partial support for rich text via the Markdown syntax. It adds features not available with plain Markdown syntax. Lite offers a number of export formats, including LaTeX, but not Markdown. For example, Markdown plugins exist for every major blogging platform. Knitr consists of standard e.g. Markdown document with R-code chunks integrated in the document. Specifications in Markdown abstracts code behind the steps.