Create a child SDO_DataObject of the default type for the
property identified.
The data object is automatically inserted into the tree
and a reference to it is returned.
参数
identifier
Identifies the property for the data object type to be created.
Can be either a property name (string),
or property index (int).
返回值
Returns the newly created SDO_DataObject.
异常
SDO_PropertyNotFoundException
Thrown if the identifier does not correspond to a
property of the data object.