The lcMatchingItemFeedback element was deprecated in DITA version 1.3. It was replaced with the lcMatchingItemFeedback2 element. It was originally intended to provide feedback on the match as a whole or on correct and incorrect matches or both.
+ topic/stentry learningInteractionBase-d/stentry learning-d/lcMatchingItemFeedback
... <lcMatchingPair> <lcItem>Toronto</lcItem> <lcMatchingItem>Blue Jays</lcMatchingItem> <lcMatchingItemFeedback> <lcFeedbackCorrect>The Blue Jays play in Toronto's SkyDome</lcFeedbackCorrect> <lcFeedbackIncorrect>That is not Toronto's home team.</lcFeedbackIncorrect> </lcMatchingItemFeedback> </lcMatchingPair> ...