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

@return [String]
A code for the named area this distributon record is about. See
http://en.wikipedia.org/wiki/ISO_3166-2 for state codes within a
country, otherwise use a prefix for each code to indicate the source of
the code. See http://rs.gbif.org/areas/ for GBIF recommended area

Example: “TDWG:AGS-TF; ISO3166:AR; WOEID:564721”
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