This PowerPoint presentation, delivered at the ADL Repositories Summit a couple of weeks ago, surveys the process used by the Eisenhower National Clearinghouse to convert learning object metadata from the format harvested from the NSDL repository (using Open Archives Initiative (OAI) harvesting, in Dublin Core format) to its own version of the IEEE Learning Object Metadata format. This conversion is accomplished via what is called a 'crosswalk' (and that's your word for the day). The presentation is based on an article in D-Lib and is supported with reference documents describing the Crosswalks and the ENC Indexing Guidelines. Great stuff.
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