##markup (UK: mark-up)##
[Wikipedia 2014-10-03] A (document) Markup language is a modern system for annotating a document in a way that is syntactically distinguishable from the text. The idea and terminology evolved from the "marking up" of paper manuscripts, i.e. the revision instructions by editors, traditionally written with a blue pencil on authors' manuscripts. In digital media this "blue pencil instruction text" was replaced by tags, that is, instructions are expressed directly by tags or "instruction text encapsulated by tags”.
[STEMMA] The scheme by which text annotation is represented or encoded.