Foreword
AS I WRITE THIS FOREWORD in July 2006, I know something big is about to happen.
Developers are discovering the power of having machine-readable representations of their programs that match their intention. This idea is sometimes referred to using the shorthand phrase code as data.
More importantly, developers are realizing that no runtime architect or language designer is all that qualified to define the schema for that data—a domain expert is the only one who has the right expertise. This idea is sometimes referred to as domain-specific languages.
Systems like Smalltalk, the Java Virtual Machine (JVM), and the Common Language Runtime (CLR) have proven that there is value in having machine-readable representations of type definitions ...
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