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A Note on Terminology
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It is, unfortunately, undeniable that the term rules is not a very good one (certainly it is not very specific, nor very descriptive). And the term business rules is not much better; in particular, not all enterprises are businesses. As already indicated, this chapter does make use of these terms; however, it does so primarily because other publications in the field do so too! Be that as it may, the really important point is that the technology under discussion is a declarative one. To be more specific, rules, whatever they might be called, are declarative, not procedural, in nature: Application software possibly some system software too is specified declaratively, and the resulting declarative specifications are directly compilable and executable.
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CHAPTER 15 TWELVE RULES FOR BUSINESS RULES
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Further Preliminary Remarks
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It might be felt that prescriptions such as the ones to be discussed in this chapter ought all to be independent of one another. After all, such independence is surely desirable for the same kinds of reasons that the prescriptions themselves demand certain kinds of independence in business rule systems. However, it turns out to be more convenient to state the prescriptions in a kind of layered fashion, with later ones building on earlier ones; thus, the various prescriptions are not, nor are they claimed to be, fully independent of one another, despite any possible advantage that might follow from trying to make them so. What is more, some of the prescriptions overlap others (that is, some requirements are stated in more than one place, in more than one way). Now, many readers will be aware that there are precedents for a proposal of this nature. What is more, some of those precedents have become a little discredited over time, and the writer is therefore sensitive to the possibility of criticism (especially criticism along the lines of oh no, not again 2). But business rule systems are becoming increasingly important, and it does therefore seem worthwhile the foregoing comments notwithstanding to attempt to provide some structure for the debates that will inevitably arise in the marketplace. Thus, what follows is offered as a kind of yardstick, or framework, that might conveniently be used to orient such debates; equally, it is proposed as a basis against which business rule systems might be carefully analyzed, criticized, evaluated, and perhaps judged (wording cribbed from reference [2]). That said, however, there are a couple of important caveats that need to be spelled out immediately: The prescriptions that follow are emphatically not intended as a basis for any kind of checklist evaluation. To say it again, they are offered as a framework for structuring discussion and debate; they are definitely not meant as a basis for any kind of scoring scheme. (Statements to the effect that Product P is x percent of a good business rule system are not only absurd but positively harmful, in this writer s very firm opinion.) There is no claim that the prescriptions that follow are complete or exhaustive in any absolute sense. Indeed, they are meant to be open-ended, in general. That is to say, anything not explicitly prescribed is permitted, unless it clashes with something explicitly prohibited; likewise, anything not explicitly prohibited is permitted too, unless it clashes with something explicitly prescribed. The list of prescriptions follows immediately. Note: Some of those prescriptions (the first two in particular) just repeat certain assumptions already spelled out above; however, the assumptions in question are sufficiently important as to deserve elevation to the status of prescriptions per se. The final section of the chapter (before the acknowledgments and list of references) presents a summary of the entire set of prescriptions.
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2. Especially since, as it happens, the number of prescriptions is exactly twelve.
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CHAPTER 15 TWELVE RULES FOR BUSINESS RULES
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Prescription 1: Executable Rules
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Rules shall be compilable see Prescription 10 and executable (even when the rule in question is basically just a data definition rule, as in the case of, e.g., CREATE TABLE in SQL).
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