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title: "Pollen"
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Pollen is a domain-specific language written in Racket that lets you [tag information with functions](https://docs.racket-lang.org/pollen/third-tutorial.html#%28part._.Tags___tag_functions%29). So, ◊em{text} will apply a function that applies the "italicize" to "text" as an argument. For a basic overview, [see this presentation](https://www.youtube.com/watch?v=IMz09jYOgoc).