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Some Observations on Metadata and Digital LibrariesArms, Caroline (Library of Congress, 2000)The metadata elements needed to allow specialist users to find, identify, select, and obtain the resources they need and to navigate the web of relationships among them do not necessarily match the elements and rules for bibliographic cataloging of materials traditionally held by libraries. This paper will draw on experience gathering together metadata from heterogeneous sources for American Memory, particularly for the collections digitized and cataloged at other institutions through the LC/Ameritech competition. It will also reflect on several initiatives to develop rich structured metadata schemes for specific domains and others to find simple approaches to support resource discovery across domains. Trends and commonalities will be identified and influences among metadata schemes highlighted.