The entity defined as concept encompasses a comprehensive range of abstractions that may be the subject of a work: fields of knowledge, disciplines, schools of thought (philosophies, religions, political ideologies, etc.), theories, processes, techniques, practices, etc. A concept may be broad in nature or narrowly defined and precise. For the purposes of this model concepts are treated as entities only to the extent that they are the subject of a work (e.g., as the subject of a philosophical treatise, of a critique of a school of thought, etc.).
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