Receiving data from a client machine, the data representing selection of a subset of components of a set of components of a fixed query response representation; performing a map/reduce function on the data to retrieve the subset of components; and transmitting the subset of components to the client machine. The data may include an Xpath expression that is created at the client machine or at a server and the map/reduce function may be performed according to a design pattern that designates the pattern of components in a fixed query response representation designated by the client machine.