16. The method of claim 15 , wherein said configuration data further specifies for said second context object respective values for a set of parameters, wherein said second context object upon invocation uses the respective values for said set of parameters to interface with said external source and to retrieve said second data.
16. The method of claim 15 , wherein said configuration data further specifies for said second context object respective values for a set of parameters, wherein said second context object upon invocation uses the respective values for said set of parameters to interface with said external source and to retrieve said second data. 17. The method of claim 16 , wherein said external source is a database server, wherein said set of parameters comprise an identifier of the server, an identifier of the database, and authentication information.