Meta-knowledge is that a system knows what is knows, i.e. that the rules of the system be able to explicitly differentiate between knowledge that the system does have and knowledge that it doesn't. Theo's designers wanted Theo to have meta-knowledge. The frame-based system directly facilitates meta-knowledge. A filled slot means that the knowledge is known. Anything else means that the knowledge is unknown. Meta-knowledge in Theo is used to realize both meta-reasoning and self-reflection and well as contributing to the robustness of other capabilities.
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