Sourceval to_value :
RecommendationPreferencesDetail.t list->[> `List of
[> `Structure of
(string
* [> `Enum of string| `List of
[> `Structure of
(string
* [> `Enum of string| `List of
[> `String of PreferredResourceValue.t ] list| `Structure of (string * [> `Enum of string ]) list ])
list ]
list| `Structure of
(string * [> `Enum of string| `String of ScopeValue.t ]) list ])
list ]
list ]