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acceptedNameUsageID (http://rs.tdwg.org/dwc/terms/acceptedNameUsageID)

@return [String]
This represents a second column in a synonym record that points to
the record representing the valid (zoological) or accepted (botanical)
name using the taxonID of that record as the “pointer.”

Example: 8fa58e08-08de-4ac1-b69c-1235340b7001
Please help! Open an issue on GitHub if this assessment is incorrect.