H5T_ENUM_VALUEOF finds the value that corresponds to the specified
name of the enumeration datatype
Values returned in
value will be of the enumerated type’s base type, that is, the datatype used by H5T_ENUM_CREATE when the enumerated type was created.
value buffer must be at least large enough to hold a value of that base type. If the size is unknown, you can determine it with H5T_GET_SIZE,
dtype_id is set to the base type.