January 2004
Intermediate to advanced
483 pages
13h 35m
English
Content preview from How to Build a Business Rules Engine
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A principle of data modeling is that every attribute in a data model (every column
in a physical database table) must store one kind and only one kind of information.
A corollary is that one kind of information is stored in only one place in a database.
The situation for business rules is very similar. One business rule should encapsulate
logic that consists of only one logical statement. It should not encapsulate many dif-
ferent logical statements. A corollary is that a unique piece of logic in a business is
represented by one and only one business rule. This does not mean that a business
rule cannot contain components that are themselves the products of other business
rules. In fact, this is quite common, as we shall see in later chapters.
Although ...
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