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 | This page in a nutshell: If one topic includes another, then in some rare situations this can help in linking and disambiguation. |
There are many situations in which one topic includes another, either conceptually or physically or both. Australia includes Sydney. Mathematics includes algebra.
This can even have many levels, like the layers of an onion. The outer layers are sometimes called higher levels, giving a broader picture, and the inner lower levels, giving a more detailed view.
But the important thing is, where the topic of one article includes another but the common name for both topics is the same, this structure can be helpful in deciding how to disambiguate and link to the articles concerned. Our priority here is reader experience. In general, it's far better to send someone who wants to know about the inner layer (the lower level) to an article on the whole onion than it is to send someone who wants to know about the whole onion (the higher level) straight to the middle layer.
Ideally we want everyone to go straight to the article they want of course. But that isn't always possible.
| “ | When in doubt, go to the top | ” |