Editing Knowledge-based systems (section)

===Advances driven by enhanced architecture===
As knowledge-based systems became more complex, the techniques used to represent the knowledge base became more sophisticated and included logic, term-rewriting systems, conceptual graphs, and [[Frame (artificial intelligence)|frames]]. 

Frames, for example, are a way representing world knowledge using techniques that can be seen as analogous to [[object-oriented programming]], specifically classes and subclasses, hierarchies and relations between classes, and behavior{{clarify|date=May 2024}} of objects. With the knowledge base more structured, reasoning could now occur not only by independent rules and logical inference, but also based on interactions within the knowledge base itself. For example, procedures stored as [[Daemon (computing)|daemons]] on{{clarify|date=May 2024}} objects could fire and could replicate the chaining behavior of rules.<ref>{{Cite journal |last=Mettrey |first=William |year=1987 |title=An Assessment of Tools for Building Large Knowledge- BasedSystems |url=http://www.aaai.org/ojs/index.php/aimagazine/article/viewArticle/625 |url-status=dead |journal=AI Magazine |volume=8 |issue=4 |archive-url=https://web.archive.org/web/20131110022104/http://www.aaai.org/ojs/index.php/aimagazine/article/viewArticle/625 |archive-date=2013-11-10 |access-date=2013-11-10}}</ref>