<P> In computer text processing, a markup language is a 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 ." However the whole idea of a mark up language is to avoid the formatting work for the text, as the tags in the mark up language serve the purpose to format the appropriate text (like a header or beginning of a next para...etc .). Every tag used in a Markup language has a property to format the text we write . </P> <P> Examples include typesetting instructions such as those found in troff, TeX and LaTeX, or structural markers such as XML tags . Markup instructs the software that displays the text to carry out appropriate actions, but is omitted from the version of the text that users see . </P>

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