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Dijkstra once wrote that computer science is no more about
computers than astronomy is about telescopes. Despite the many
incredible advances in c- puter science from times that predate
practical mechanical computing, there is still a myriad of
fundamental questions in understanding the interface between
computers and the rest of the world. Why is it still hard to
mechanize many tasks that seem to be fundamentally routine, even as
we see ever-increasing - pacity for raw mechanical computing? The
disciplined study of domain-speci?c languages (DSLs) is an emerging
area in computer science, and is one which has the potential to
revolutionize the ?eld, and bring us closer to answering this
question. DSLs are formalisms that have four general
characteristics. - They relate to a well-de?ned domain of
discourse, be it controlling tra?c lights or space ships. - They
have well-de?ned notation, such as the ones that exist for
prescribing music, dance routines, or strategy in a football game.
- The informal or intuitive meaning of the notation is clear. This
can easily be overlooked, especially since intuitive meaning can be
expressed by many di?erent notations that may be received very
di?erently by users. - The formal meaning is clear and
mechanizable, as is, hopefully, the case for the instructions we
give to our bank or to a merchant online.
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