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knobunc's reply is good. Check Language::Prolog
As far as I know, it is currently a beta version.
But, if you want to "reinvent the wheel", you should consider reading something on the following topics:
Logic programming slogan "I tell you what I know and what I'd like to know, without telling you how" showed its practical unapplicability over the years: every logic programming language includes extralogic operators, such as cut, that introduce elements of imperative programming in the language ("I tell you what I know and what I'd like to know, without telling you how... Well, I will help you a bit"). Despite of their impure nature, logic programming languages are very interesting and I think they're worth studying. In reply to Re: Rules-based Perl?
by larsen
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