A very different example comes up with many familiar markup languages.
It can also include other markup languages, such as wikitext.
It is an example of a compact human-readable markup language.
But it's my understanding that it's really running in a markup language, basically.
There are a number of web services that use markup languages:
Basic general information about the markup languages: creator, version, etc.
The markup language used by Wikipedia is one example.
An additional challenge lies in the aim to provide a markup language that is generally usable.
The software also features a markup language called Wakabamark.
Asciidoc, a similar lightweight markup language supporting many types of documents.