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Notes: Dublin Core: The described resource may be derived from the related resource in whole or in part. Recommended best practice is to identify the related resource by means of a string conforming to a formal identification system. This term is intended to be used with non-literal values as defined in the DCMI Abstract Model (http://dublincore.org/documents/abstract-model/). As of December 2007, the DCMI Usage Board is seeking a way to express this intention with a formal range declaration.
Audubon Core: An identifiable source from which the described resources was derived.
If the resource (image, sound, movie, identification key, etc.) was digitized from a non-digital resource, or was also previously published in a digital or printed publication, this describes the original. Do not put generally "related" publications in here. This field normally contains a free-form text description, but it may be a URI (e.g. “digitally-published://ISBN=961-90008-7-0”) if that URI can be resolved and dereferenced to provide a description of the source resource. Can be repeatable if a montage of images. Information about further provenance beyond the ultimate source should be put in the ac:derivedFrom attribute.