High Quality Content by WIKIPEDIA articles! In linguistic semantics, a case role is any of the spatially-distinguished parts of a process. In the sentence, "The dog ate food", the subject "dog" has the case role of "agent" and the object "food" has the case role of "theme". The term has its origins in linguistic semantics, but is used in computerized natural language processing, where a reasoning engine performs case role analysis to establish progressively more specialized case roles from speech: 'subject', 'agent', 'mother', 'Fred's mother', being the progression that results from the 'you gave birth to Fred.'.

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