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 weather turns out
to be worse than forecasted and are not forecasted to improve.
?- 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 66° with partly cloudy conditions, 44° dewpoints, and 11 MPH winds with a 9% 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 rain, which is not good for a picnic The current wind is questionable... The wind is now forecasted to be 14MPH, which is good for a picnic The weather did not turn out so great for the picnic, so you decided to just stay home true