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9. Flex Predicates 137<br />
Q = ['Please',choose,a,dessert,for,your,meal]<br />
A = multiple(dessert)<br />
E = file(the_complete_irish_cook)<br />
isa_relation( ?Name, ?Arity )<br />
Retrieve or check the Name and Arity of a defined relation.<br />
Example<br />
?- isa_relation( N, A ).<br />
N = parent<br />
A = 2<br />
isa_rule( ?Name,-Conditions,-Action,-Explanation,-Score )<br />
Retrieve the characteristics of a rule from the workspace. (See the predicate<br />
new_rule/5 for a description of the arguments.)<br />
Example<br />
?- isa_rule( prescribe_lomotil, C, A, E, S ).<br />
C = ( prove(complains(patient,diarrhoea)),<br />
disprove(suffers(patient,liver_complaints)),<br />
disprove(pregnant(patient)) )<br />
A = prescribe(patient,lomotil)<br />
E = file(medical7)<br />
S = 0<br />
isa_slot( ?Attribute,?Frame,-Value )<br />
Test for the current value for the attribute of a frame.<br />
A call to isa_slot/3 will backtrack through all known current values and<br />
unify Attribute with the name of the attribute, Frame with its frame and<br />
bind Value to the current value of the attribute. Before the access is<br />
allowed any watchdog procedures (see watchdog/6) are first checked.<br />
The call fails if there are no current values defined.<br />
Example<br />
?- isa_slot( A, F, V ).<br />
A = habitat, F = moby_dick, V = [atlantic,arctic]<br />
A = predator, F = moby_dick, V = jonah<br />
A = food, F = moby_dick, V = fish<br />
?- isa_slot( food, moby_dick, V ).<br />
V = fish<br />
isa_synonym( ?Name,-Term )<br />
<strong>flex</strong> toolkit<br />
7
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