16. The data processing apparatus of claim 15 , wherein one or more stream properties data structures in the description language define primal streams available to the stream processing system and wherein each stream properties data structure is initialized with one or more property values for each primal stream.
16. The data processing apparatus of claim 15 , wherein one or more stream properties data structures in the description language define primal streams available to the stream processing system and wherein each stream properties data structure is initialized with one or more property values for each primal stream. 17. The data processing apparatus of claim 16 , wherein the domain definition data structure comprises a plurality of stream processing component data structures in the description language, wherein each stream processing component data structure describes one or more input ports and one or more output ports.