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They don't. Linguistics is one site. Its site ID is 12. It has three categories - Q&A, Meta, and Resources - with IDs respectively of 36, 37, and 40. Each category has a tag set, which contai...
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#1: Initial revision
They don't. Linguistics is one site. Its site ID is 12. It has three _categories_ - Q&A, Meta, and Resources - with IDs respectively of 36, 37, and 40. Each category has a _tag set_, which contains tags used in that category; tag sets can be shared across multiple categories. The tags page URL starts with `/categories/37` because it's looking up tags _for that category_ (or, technically, within that category's tag set). Parent and child tags are no different to each other; they're both fully-qualified top-level tags, just that they're related to one another - hence, the URL is no different other than the ID.