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Source

A reference to a resource from which the present resource is derived.

Optional

The present resource may be derived from the Source resource in whole or in part. Recommended best practice is to reference the resource by means of a string or number conforming to a formal identification system.
Best practice: Use only when the described resource is the result of digitization of non-digital originals. Otherwise, use Relation. Optionally metadata about the current location and call number of the digitized publication can be added.
Use: Guidelines for Encoding Bibliographic Citation Information in Dublin Core Metadata (http://dublincore.org/documents/dc-citation-guidelines/).

• dc:relation
  
• dc:identifier