Assert with concepts

 <[email protected]>Hy. See the comands below:

defconcept(Person ?x)
defrelation(likes ((Person ?x)(Person ?x))

assert(Person James)
assert(not(Person Frank))

assert(likes James Frank)

that create the relation without problems. How can I do to make that this
assert returns a error for Frank don't be a Person?

thanks. <[email protected]>

-- 
Laécio Lima dos Santos
graduando em Ciências da Computação, UnB
Brasilia, DF - Brasil

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