Dwca::GbifProfile::Reference#type=

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

@return [String]
Used to assign a bibliographic reference to list of taxonomic or
nomenclatural categories. Best practice is to use a controlled
vocabulary. See an example below in data type.

Vocabulary: http://rs.gbif.org/vocabulary/gbif/reference_type.xml

Example: “Original publication of new combination (comb nov.)”
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