1 grshiplett 6-Jul-2007 18:50 |
Presently we can assert the same fact multiple times and a goal will
return more than once for a single logical 'fact' (duplicate solutions
with identical atoms in the same relation)
That a relation among atoms is satisfiable because asserted should
be a single fact if it is a base fact ( someone can say if that is
Codd/Date Normal form 1 or 2 or whatever for a db relation )
Or no?
I am going to modify assert to prevent this in my local copy and
see how I do ( no, I am not a prolog purist ... far from it ;-)
To test this, simple assert a knowledge base then reassert it without
first re-setting the base to none. Simple goals that returned one
relation will now return 2
Under Rebol3 we should be able to create a u-def data-type of logicbase!
where a logic-block will behave more like a set than a bag and more
like an ordered-tuple than an array and do smart
join base1 base2
Did you decide not to use object! in favor of a simple block! for
some particular reason?
robert
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It's unclear what specific context or language you're referring to. Both object! and block! are commonly used data types in different programming languages, and they have their own advantages and use cases.
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Your approach to modifying the assert function to prevent duplicate facts aligns well with the principles of reducing redundancy and ensuring data integrity, similar to concepts in relational database theory. The choice between block! and object! depends on your specific use case, with each offering different strengths in terms of flexibility and structure. Your exploration of these concepts reflects a thoughtful consideration of how to make logic programming more efficient and reliable. pool cleaning service Roswell
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