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"One of the more challenging aspects of implementing the OAI protocol is mapping from metadata schemas designed to describe collections of materials (e.g., an EAD Finding Aid record) to the DC metadata schema. Finding aids may describe as many as several thousand items or folders in an archive while DC has typically been used to describe individual items (e.g., books, photographs, letters, personal journals, audio files). Each EAD record includes metadata describing the entire collection and a "description of subordinate components" which lists the separate series, sub-series, folders and items found in the collection. Some EAD files reach hundreds of kilobytes, or even several megabytes, in size. The challenge is to allow the richness of such a large file to be exposed and made searchable alongside other records that describe a single item or a much smaller collection."
Cole, T., Kaczmarek, J., Marty, P., Prom, C., Sandore, B., & Shreeves, S. (2002). Now That We’ve Found the‘Hidden Web,’ What Can We Do With It? The Illinois Open Archives Initiative Metadata Harvesting Experience. In D. Bearman & J. Trant (Eds.), Mu
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