Following is a demo of the Picnic Belief Revision program.
This scenario models belief revision when the forecast is favorable for a picnic, but the actual conditions
end up worse than the forecast but are still good enough.
?- picnic. Walking outside, the current weather looks good for a picnic later... It is currently sunny with mild temperatures, no humidity, and calm winds The current forecast looks good for a picnic later... The forecast has a temperature of 70° with sunny conditions, 55° dewpoints, and 9 MPH winds with a 26% chance of precipitation. It is now time for the picnic... Walking outside, the weather looks worse than forecasted... It is currently precipitating with distant clearing with mild temperatures, no humidity, and breezy winds The current weather conditions are questionable... The weather conditions are now forecasted to be partly cloudy, which is good for a picnic The current wind is questionable... The wind is now forecasted to be 6MPH, which is good for a picnic The weather turned out to be great for the picnic, so you decide to go and have one! true