09-17-2021, 07:55 AM
I have not yet seen any clarification on the meaning and use of (append) - does this mean the use of (append ) is not needed and it is depreciated for use? or is it an oversight?
Is there a ludeme that does what the following unreliable coding should do?
(and (<A>) (priority (<B> (then <C>)) (<C>))
i.e. A & C with B required before C, IF <B> EXISTS - so C always happens even without A&B
--------------------
Contrast the above with
(and (<A>) (<B>) (then (<C>))
which appears to be equivalent to:
(and ((<A>) (then (<C>))) ((<B>) (then (<C>))))
in this case C doesn't happen without a combination of A or B
Is there a ludeme that does what the following unreliable coding should do?
(and (<A>) (priority (<B> (then <C>)) (<C>))
i.e. A & C with B required before C, IF <B> EXISTS - so C always happens even without A&B
--------------------
Contrast the above with
(and (<A>) (<B>) (then (<C>))
which appears to be equivalent to:
(and ((<A>) (then (<C>))) ((<B>) (then (<C>))))
in this case C doesn't happen without a combination of A or B