MANDATORY = "mandatory"
REGEXP = "regexp"
CHOICES = "choices"
CROSSREF = 'crossref'
CROSSREF_NAME = 'crossref_name'
MISSING = "missing"
VALIDATION = 'validation'
ERROR_CODE = 'error_code'
FIELD = 'field'
MULTIPLE = 'multiple'
TYPE = 'type'
COLUMNS = 'columns'
SOURCE = "sources"
SEPARATOR = "separator"
MATCH = 'match'
VALUES = 'values'
DATE = 'date'
COORDINATES = 'coord'
NUMBER = 'number'
TAXON = 'taxon'
UNIQUE = 'unique'
ROW_VALIDATION = 'row_validation'
NAGOYA = 'nagoya'
BIBLIO = 'bibliography'
