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source (http://purl.org/dc/terms/source)

@return [String]
Used to link to an external representation of the data record such as
in a source web database. A URI link or reference to the source of this
record. A link to a webpage or RESTful webservice is recommended.
URI is mandatory format.

Example: “http://www.catalogueoflife.org/annual-checklist/show_species_details.php?record_id=6197868”
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