Executable XML (aka Lisp)
In a project that I have been working on for quite some time, the back office system receives XML messages from the front and middle office systems for processing. It is a securities trading and settlement system for one of the big financial houses of the world - typical messages are trades, settlements, position etc. which reach the back-office after the trade is made. Like any sane architect we have designed the system based on the Java EE stack (nowadays you never get fired for choosing Java ..) centered around a message oriented middleware transporting XML messages with gay abandon. The system has gone live for many implementations and has been delivering satisfactory throughput all over.
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