sidefile-antipattern

The  sidefile-antipattern  is a violation of the DRY principle by the use of secondary files (typically in some one-off XML format) to provide information that is a duplicate of information available in primary files on a website (in HTML), and is an antipattern due to typical DRY violation problems such as out-of-date, missing, corrupted, or outright false data.

Examples
Examples of the sidefile antpattern:
 * feed file (Atom, RSS, etc.)
 * sitemap.xml
 * FOAF