Be aware that a single identifier may refer to multiple models from different years or with different characteristics. In this case the Generation and/or the Variant could not be determined exactly and the key may be missing.
In these cases, a key 'Variants' could be used, which has an array value, with multiple dictionaries with the 'Generation' + 'Variant' keys.
In these cases, a key 'Variants' could be used, which has an array value, with multiple dictionaries with the 'Generation' + 'Variant' keys.