kind_von(karl_VI, leopold_I).
kind_von(maria_theresia, karl_VI).
!.............^
! ^^Syntaxfehler Funktorargumente unterbrochen, , oder ) fehlt.
kind_von(joseph_II, maria_theresia).

--**-  2.Bsp. n599 ------------------------
We have corrected the error, but the error messages have not yet been removed. However, the mode line tells us that the 2nd example is modified, so error messages may be outdated. And in fact they are.
**NEXT: Hence update the example pressing [DO].
[logprog|GUPU|UWN]