Separation of content and presentation (or separation of content and style) is a design principle under which visual and design aspects (presentation and style) are separated from the core material and structure (content) of a document.[non-primary source needed] A typical analogy used to explain this principle is the distinction between the human skeleton (as the structural component) and human flesh (as the visual component) which makes up the body's appearance. Common applications of this principle are seen in Web design (HTML and CSS) and markup language (see LaTeX).
This principle is not a rigid guideline, but serves more as best practice for keeping appearance and structure separate. In many cases, the design and development aspects of a project are performed by different people, so keeping both aspects separated ensures both initial production accountability and later maintenance simplification, as in the don't repeat yourself (DRY) principle.
LaTeX is a document markup language that focuses primarily on the content and structure of a document. With this methodology, academic writings and publication can be structured and styled with minimal effort by the creator, and can be quickly reformatted for different purposes.
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