Page History
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The information model on the left uses a heading of 'Family history' to indicate that the named problem refers to a family history of that problem. The information model on the right uses the terminology value to indicate that the problem refers to a family history instance.
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When querying over data, which may be collected in either format, both the semantics of the information model and the semantics of the data instances must be considered. One way of achieving this is to use an 'expression template' to convert all data instances into a Description Logic representation, and use this to reason over the data.
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