XML in a Nutshell, 3rd Edition

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Comments

Despite a long history in HTML of using comments for tasks like Server-Side Includes (SSI) and for hiding JavaScript code and Cascading Style Sheets, using comments for anything other than human-readable notes is generally a bad idea in XML. XML parsers may (and frequently do) discard comments entirely, keeping them from reaching an application at all. Transformations generally discard comments as well.

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