Currently, when you design a report with SqlDataSource, ObjectDataSource, etc. you need to have access to the corresponding database, assemblies, etc. to see the fields and use the drag-and-drop functionality of the report designers.

The requirement is to embed the corresponding schema in the report or designer to let the report creator access the data source fields even without these external resources.

As an example, in the WebServiceDataSource the report creator may use inline JSON rather than connecting to the Web Service. This saves time and resources required for establishing the connection that is in fact not necessary for design purposes.