A domain processor includes at least one robot modeler, at least one domain modeler, and at least one Query Processor Modeler. The robot modeler includes means for modeling at least one computer-based robot, the robot adapted for accessing at least one web-based data source including entities in a predefined domain. The domain modeler includes means for modeling at least one domain model and means for establishing at least one extraction model and at least one storage model. The Query Processor Modeler includes means for selecting at least two Query Processor elements from a set of predefined query processor elements, means for combining the selected Query Processor elements, and means for executing the associated query processor elements on at least one computer system, at least one of the query processor elements of the associated query processor elements being a Robot query processor Element adapted for accessing the web-based data source.