mappings/VegCore-VegBIEN.csv: taxonoccurrence.authortaxoncode alternatives: Use _first instead of _alt because when one of these fields is present, it can be used directly even if it's sometimes NULL, without needing to spend a lot of time _alting together fields that won't be used. Datasources where the authortaxoncode is sometimes NULL usually have a separate sourceaccessioncode for the taxonoccurrence. (In the rare case that they don't, they should map a non-NULL field to recordNumber or tag to ensure that taxonoccurrences can be uniquely identified.)
mappings/VegCore-VegBIEN.csv: taxonoccurrence.authortaxoncode alternatives: Use _first instead of _alt because when one of these fields is present, it can be used directly even if it's sometimes NULL, without needing to spend a lot of time _alting together fields that won't be used. Datasources where the authortaxoncode is sometimes NULL usually have a separate sourceaccessioncode for the taxonoccurrence. (In the rare case that they don't, they should map a non-NULL field to recordNumber or tag to ensure that taxonoccurrences can be uniquely identified.)