12. The method of claim 9 , further comprising forming an outgoing instance based on user input made using the generated graphical user interface.
12. The method of claim 9 , further comprising forming an outgoing instance based on user input made using the generated graphical user interface. 13. The method of claim 12 , wherein forming the outgoing instance comprises: receiving the user input; validating the user input against the schema definition; and generating an XML instance containing the portion of data.