Terms and Constraints
Different definitions of terms are used, generating different kinds of constraint logic programming: over trees, reals, or finite domains. A kind of constraint that is always present is the equality of terms. Such constraints are necessary because the interpreter adds t1=t2 to the goal whenever a literal P(...t1...) is replaced with the body of a clause fresh variant whose head is P(...t2...).
Read more about this topic: Constraint Logic Programming
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