Discussion
Where is the open world assumption appropriate?
Answer: A
On the web, or in a medical record, the absence of a statement means nothing has been recorded rather than that it is false, so no negative conclusion may be drawn. Description logics adopt this assumption for that reason. Infinite domains, speed and volatility are separate considerations. Choosing the assumption that matches how the knowledge was actually collected, rather than the one that makes reasoning convenient, is essential if the conclusions are to be trusted.
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