> Isn't this kinda redundant? science-fiction is already fiction, it's in the name. This is nit-picking the specific example rather than engaging with the GP's

> Isn't this kinda redundant? science-fiction is already fiction, it's in the name. This is nit-picking the specific example rather than engaging with the GP's point. There are definitely genres that span the fiction/non-fiction divide (like romance, horror, politics, judaica, and many more). Interestingly, hierarchical systems used by libraries tend to ignore genre. The Dewey Decimal system doesn't classify literature by genre but instead by language, though some overarching genres (drama vs poetry) are treated as subcategories of language (e.g., German poetry is 831, French poetry is 841), but only for major European languages.