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The Advanced Distributed Learning Registry was developed by the ADL Initiative and is the central search point for the discovery of digital objects related to DoD training, education, performance, and decision-aiding that can be redeployed, rearranged, repurposed, and rewritten. In much the same way that a card from the card catalog contains descriptive information about books in a library, the ADL Registry contains all of the registered entries that contain metadata about the digital object in a repository. "It is the first instance of a registry-based approach to repository federation resulting from the Content Object Repository Discovery and Registration/Resolution Architecture (CORDRA) project. (Excerpt from <a href="http://en.wikipedia.org/wiki/ADL_Registry">Wikipedia article: Content Object Repository Discovery and Registration/Resolution Architecture</a>)