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Concluding Remarks
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I hope I ve covered enough ground to give you reason to believe as I do that trees and tree processing can be handled perfectly well in a relational system. First, of course, it s clearly possible to write procedural code for such tasks. Second, and more important, it s also possible to define high-level relational operators (e.g., the proposed TREESORT operator) that can raise the level of abstraction to a level comparable to that supported by more familiar relational operators such as join. Of course, it won t have escaped your notice that recursion is important in this connection but recursion is a time-tested and well-respected technique in other areas of computer science, and there s no reason why relational systems shouldn t provide good support for recursion too.
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Acknowledgments
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I d like to thank Hugh Darwen and Fabian Pascal for their comments on earlier drafts of this chapter.
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Twelve Rules for Business Rules
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No rules, however wise, are a substitute for affection and tact. Bertrand Russell his chapter has to do with what are commonly called business rules. Its aim is to propose a set of rules about such rules rules that, it is suggested, a good rule engine really ought to abide by. Such rules about rules might well be called metarules; they might equally well be described as objectives; however, the chapter refers to them as prescriptions.1 Disclaimer: The original version of this chapter was prepared under a contract with Versata Inc., a company that has a business rule product to sell. However, it was categorically not written in such a way as to make Versata look good ; the various prescriptions it describes were designed without any special reference to the current commercial scene in general or Versata s product in particular. In other words, the chapter serves to document my own opinion merely my opinion, that is, as to what business rule products ought to strive for in the future.
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Assumptions
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It is convenient to begin by stating some underlying assumptions and introducing some terminology: The purpose of any given piece of application software an application for short is to implement some enterprise work item (i.e., some piece of functionality that is relevant to the enterprise in question).
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1. I decided to include this chapter in this part of the book because rule engines i.e., software systems that support the development of applications by means of business rules can be regarded as implementing a large piece of the relational model that ought by rights to have been implemented many years ago by the relational DBMS vendors, but in fact never was. Part II ( A Relational Perspective ) of my book WHAT Not HOW: The Business Rules Approach to Application Development (Addison-Wesley, 2000) elaborates on this claim and explains it in depth.
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CHAPTER 15 TWELVE RULES FOR BUSINESS RULES
Note: The term application is used here and in what follows in a very loose kind of way; thus, a given application might be a simple subroutine (e.g., a function to calculate withholding), or a large collection of mutually interacting programs (e.g., a fully integrated corporate accounting system), or anything in between. The enterprise work item in question is specified as a set of definitions (data definitions, access definitions, form definitions, and so forth). To the maximum extent logically possible, those definitions are declarative i.e., nonprocedural in nature. They are also formal (necessarily so, of course). In what follows, they are referred to as business rules, or just rules for short. Note: The reason for the slight degree of hesitancy in the foregoing paragraph ( To the maximum extent logically possible ) is that the rules in question might include certain stimulus/response rules, which do include an element of procedurality (see Prescription 3, later). Business rules are compilable i.e., mechanically convertible into executable code and hence, loosely, executable. In other words, the set of rules constituting the declarative specification for a given application is the source code for that application, by definition (pun intended). Thus, the activities of (a) specifying or defining the application, and (b) developing or building it, are in fact one and the same. Note: It follows from the foregoing that, so far as this chapter is concerned, the terms rules and business rules are reserved to mean rules that can be automated. Other writers use the term more generally. For example, the final report of the GUIDE Business Rules Project [3] defines a business rule to be a statement that defines or constrains some aspect of the business. By this definition, a statement to the effect that the last person to leave the premises must turn off the lights might qualify as a business rule but not one that is very interesting from the point of view of business automation. To put the matter another way, not all business policies and protocols are capable of being automated, and this chapter is concerned only with ones that are. Finally, the software system that is responsible for compiling and overseeing the execution of such declaratively specified applications is called the rule engine.
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