25. A system comprising: a semantic layer; a computer to provide a Web Server to: (a) receive a Web Service call that is associated with: (i) a part of a report and (ii) a Web Service, the report part associated with queries of the semantic layer, the report including a report part other than the report part associated with the Web Service call, the Web Service not associated with a Web Service call that is associated with the other report part, and (b) determine, based on the Web Service call that is associated with the part of the report and the Web Service, a query to return contents of the report part; and a computer to provide a report server to receive the query and to return the contents of the report part to the Web Server; wherein the Web Service includes a plurality of descriptions of Web Service calls that are to return contents of the report part and are stored in a repository.
30. A system according to claim 25 , wherein the Web Service call is associated with drilling parameters to specify a drilling direction, drilling steps and a drilling target, wherein the query is to return drilled-down contents of the report part based on the drilling parameters, and wherein the contents of the report part returned by the report server are drilled-down based on the drilling parameters.