Levels, processes, structures, constructs, filters, categories, semantics Metadata standards. Knowledge Organization Systems. Formal languages and formal ontologies. Reasoning and inference Knowledge Acquisition
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• Lakoff, G. (1987). Women, Fire, and Dangerous Things: What Categories Reveal about the Mind. University of Chicago Press.
• Sowa, J. F. (2000). Knowledge Representation: logical, philosophical and computational foundations. Brooks / Cole.