AMOUNT
                    An Amount, and currency, as defined in UN/CEFACT's CCTS
                    
                
                
                    CODE
                    A code for an unespecified concept
                    
                
                
                    CODE_COUNTRY
                    Code identifying a country (Compulsory use of ISO 3166-1 alpha 2
                    
                
                
                    DATE
                    Date values (format YYYY-DD-MM)
                    
                
                
                    DESCRIPTION
                    Textual field
                    
                
                
                    EVIDENCE_URL
                    URL, namely pointing to an evidence
                    
                
                
                    INDICATOR
                    "true" or "false" values representing "Yes" affirmative or "No" negative answers
                    
                
                
                    PERCENTAGE
                    A decimal number representing a percent (e.g. 0.1)
                    
                
                
                    PERIOD
                    Period object as defined in UBL-2.1
                    
                
                
                    QUANTITY_INTEGER
                    A number representing a quantity in a specific unit of measure. The unit has to be specified (e.g. Kg).
        
                    
                
                
                    QUANTITY_YEAR
                    A non-negative integer representing a year. The unit has to be specified as YEAR
                    
                
                
                    QUANTITY
                    A number representing a generic quantity with no unit specified.