Concept help - Data Element Derivation

A data element derivation is a formal description of how a particular Data Element can be calculated based on the values of other data elements.

For example, a data element describing a Person-Body Mass Index, BMI Value can be derived from the data elements Person-Weight, Kg and Person-Height, cm according to the derivation rule BMI = Weight/Height².

ISO/IEC 11179-3 Section 11.5.2.6

Data_Element_Derivation is a class each instance of which models a data element derivation (3.2.33), the application of a derivation rule (3.2.45) to one or more input data elements (3.2.28) to derive one or more output data elements.

Data_Element_Derivation is a class that associates the Data_Element(s) (11.5.2.1) that serve as sources or inputs with a Derivation_Rule (11.5.2.5) and the Data_Element(s) that are the products or outputs of the Derivation_Rule.

ISO/IEC 11179-3 Section 11.5.2.5

Derivation_Rule is a class each instance of which models a derivation rule (3.2.45), logical, mathematical, and/or other operations specifying derivation. The Derivation_Rule may range from a simple operation such as subtraction to a very complex set of derivations (derivation being defined as a relationship between a Derivation_Rule and an input set upon which it acts). Derivation_Rules are not limited to arithmetic and logical operations.

A Derivation_Rule may have a derivation_rule_application association with zero or more application Data_Element_Derivations, where the Derivation_Rule provides the rule for the associated Data_Element_Derivation.

A Derivation_Rule may be registered as a Registered_Item without necessarily being associated with any Data_Element_Derivation. As a Registered_Item, a Derivation_Rule is directly or indirectly associated with an Administration_Record and can be identified, named, defined and optionally classified as a Classifiable_Item in a Classification_Scheme.

Every Derivation_Rule must have exactly one derivation_rule_specification of type Text that specifies the rule semantics.

Every Derivation_Rule must have exactly one derivation_rule_notation of type Notation that specifies the syntax and semantics used in the derivation_rule_specification.