Setext
Setext (Structure Enhanced Text) is a lightweight markup language used to format plain text documents such as e-newsletters, Usenet postings, and e-mails. In contrast to some other markup languages (such as HTML), the markup is easily readable without any parsing or special software. Setext was first introduced in 1991 by Ian Feldman for use in the "TidBITS" electronic newsletter. Purpose. Setext allows viewing of marked-up documents without special viewing software. To prevent errors, most large setext publications are created using a markup language such as HTML or SGML and then converted. The setext document can then  be distributed without the need for the recipient to use a HTML email or web viewer. Setext tags. The following are the most common setext tags. Standalone Setext files. By default all properly setext-ized files will have an ".etx" or ".ETX" suffix. This stands for an "emailable/enhanced text", See also. Other lightweight markup languages (inspired by Setext):