It is probable that Jeff went to the hallway. There is a very good chance that Winona is a cat. There is a better than even chance that Daniel got the milk. We believe that if 'Daniel got the milk and Winona is a cat' then Jessica is a cat. We doubt that if 'Jeff went to the hallway' or 'Winona is a cat' or both then Julius is a frog. It is likely that if 'Winona is a cat and Jeff went to the hallway' then Brian is a rhino.
There is little chance that either 'Julius is a frog' or 'Daniel got the milk' but not both.
There is a better than even chance that either 'Julius is a frog' or 'Daniel got the milk' but not both.
There is little chance that either 'Julius is a frog' or 'Daniel got the milk' but not both.

  and(A,B) :- A,B.
  or(A,B) :- A;B.
  nand(A,B) :- not(and(A,B)).
  nor(A,B) :- not(or(A,B)).
  xor(A,B) :- or(A,B), nand(A,B).

  %hop0
  0.7::factA.
  0.8::factB.
  0.6::factC.
  %hop1
  0.75::factX:-and(factC,factB).
  0.2::factY:-or(factA,factB).
  0.7::factZ:-and(factB,factA).

  %hop2
  conclusion:-xor(factY,factC).

  query(conclusion).
  
Either 'Julius is a frog' or 'Daniel got the milk' but not both.