identifier property
        
        dynamic
        identifier
        
      
getter/setter pair
      The identifier property represents any kind of identifier for
any kind of [Thing], such as ISBNs, GTIN codes, UUIDs etc
Schema.org provides dedicated properties for representing many
of these, either as textual strings or as URL (URI) links See
background notes for more
details    Supported types: PropertyValue, String, String
Implementation
dynamic identifier;