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The pneumonia hypothesis requires a
time interval for causing PC, determined from the properties on PC and
pneumonia. The PC onset is 2day from the causal statement. PC maximum
persist is 1day from the persist clause. Since the max-exist for a
primary node is the same as the persist, the max-exist for pneumonia is
2wk. Using these facts and the rules specified above determines the
time interval for pneumonia:
- PC
-
-
-
-
- max-exist:
(within the time
resolution)
- pneumonia
Since pneumonia is primary there are no further causes. This
corresponds to the explanation that is generated without a time
representation. The additional provision that the pneumonia could
actually have ended within the last day was not captured before.