Sourceval to_value :
ReferenceDataSourceUpdate.t list->[> `List of
[> `Structure of
(string
* [> `String of Id.t| `Structure of
(string
* [> `List of
[> `Structure of
(string * [> `String of RecordColumnName.t ])
list ]
list| `String of BucketARN.t| `Structure of
(string
* [> `Enum of string| `Structure of
(string
* [> `Structure of
(string * [> `String of RecordRowPath.t ])
list ])
list ])
list ])
list ])
list ]
list ]