[xtf]

Most documents are linked regarding the topic. If you go on a math page, you've got math links. Ancient and holy texts could be referenced in multiple ways, because it could be interpreted in multiple ways (or the correct way is unknown), but not something like guides. If a guide is written in more than one meaning, it is not a good guide. Learning should be more seen like a tree, you go down the route of branches and specialize more in the directions of it and the branches lead the references. At the beginning you learn the language, later you know it, otherwise every word needs to be linked.

[romaniv]

The simplest counter-example is Wikipedia. Most links on any page could lead to generic term definitions, or they could link to explanations of how those terms work withing the context of the page.

I.e. a link to "synthesizers" on a page about FM synthesis could lead to a generic article on synthesizers, or to a list of FM synthesizers released up to date.

And that's just the most obvious example. Having different "linking contexts" would allow to add more links without turning the original document into a mess.

Again, using Wikipedia as an example, you could add another "context" to the page by linking various paragraphs to citations. That would be much more user-friendly than what they do right now with bracketed numbers.