Oracle : Ошибка ORA-19204

"Non-scalar value '%s' is marked as XML attribute"
*Cause: Only scalar values (i.e. values which are not of object or collection type) can be marked as XML attribute,i.e. is prefixed by '@'. In this case, a non-scalar value was prefixed with '@'
*Action: Remove the '@' sign, or make the value a scalar.

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