17. A computer-implemented system providing optimized processing of messages, the system comprising: a computer having at least one processor and a memory; metadata, created at design time based on user input received in a graphical user interface, comprising markup language information for characterizing logical structure and physical structure of a particular message type in serialized form; a designer module for generating source code in response to said metadata, said source code for de novo creation of custom runtime components comprising newly created custom source code that is highly optimized for runtime processing of said particular message type; and a compiler for compiling the source code into said custom runtime components, so that in a runtime environment deploying said runtime components the messages are processed by said runtime components in a manner that is highly optimized for the particular message type.
21. The system of claim 17 , wherein the metadata includes logical structure and physical structure information about the particular message type.