Sanctioned specialisation is a mechanism for extending the content of a controlled terminology system by combining existing components of the system using specific mechanisms also defined in the system.
An example: pneumonia can be described as a special type of inflammation:Inflammation which has_location Lung
and this can be further specialised into pneumococcal pneumonia (caused by pneumococcus)Inflammation which has_location_Lung_is_caused_by Pneumococcus
Sanctioned specialisation is used in description logic systems such as SNOMED CT. The concept is defined in a broader context and more examples given in ISO 17115, an ISO standard.
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—Sojourner Truth (c. 17771883)