Papers get cited for very different reasons, from "historically significant paper cited in the introduction" over "related work we're building upon" to "this pr

Papers get cited for very different reasons, from "historically significant paper cited in the introduction" over "related work we're building upon" to "this proves a statement/theorem we're using". It might make sense to start categorizing citations in some way. Only for some categories I expect the authors to have read the cited paper. Some of them don't necessarily mean the cited paper is high quality. Some are recommended reading to understand the original paper, some are'nt