|InfoPath Developer Reference|
Version Added: InfoPath 2003
expression An expression that returns a DocReturnEvent object.
After you have set a reference to the XDocument object that the XDocument property of the DocReturnEvent object returns, you can use any of the properties and methods that it provides.
Security Level 2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
In the following example, the XDocument property of the DocReturnEvent object is used to set a reference to the XDocument object: