Values.AttributesSourceval to_value :
('a * AttributeValue.t) list ->
[> `Map of
([> `String of 'a ]
* [> `Structure of
(string
* [> `Boolean of BooleanAttributeValue.t
| `List of [> `String of StringAttributeValue.t ] list
| `Long of NumberAttributeValue.t
| `String of StringAttributeValue.t ])
list ])
list ]