The DEAT Business Rule Pattern Language

Russell R. Hurlbut, Ph.D.

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Rule Pattern 29: Inferred Fact

Problem Describing an Inferred Fact

The deduction of facts from other facts is a basic feature of rule processing. When no calculation is involved in deriving the new fact, then a declaration must be made that one fact implies the existence of another fact. The configuration and classification of entities often rely on the ability to infer one fact from another.


Inferred facts may be declared though definition of a formal grammar structure. The individual rules production rules declared with grammar may be organized into rule sets. The base facts become typed antecedents and consequents used in induction and deduction operations. The declaration of these rules makes no assumptions with respect to how they will be used. However this business rule pattern parameterizes this aspect as well. For example, addressing configuration problems is typical use for forward chaining inferencing. Classification problems are best suited for backward chaining inferencing. However, the intent of this section is to describe the nature of this common business rule pattern and not to digress into the realm of expert systems and rule inferencing algorithms.

Example Property Appraisal

A real estate company utilizes a search engine for identifying properties based on its close proximity of features to a subject property, which in this case is a two story single family residence. Based on key distinguishing attributes of the property, the applicable rule set and search strategy are executed.
Property Appraisal Parameters
Rule Set Residential Property
Search Strategy Backward Chain


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