Note at end of 4.2.3 is out of date

[azaroth42]

It reads as follows, which should be deleted as it's now not allowed:

[...] It also allows a compact IRI (or even an absolute IRI) to be defined as something else entirely. For example, one could specify that the term http://example.org/zoo should expand to http://example.org/river, but this usage is discouraged because it would lead to a great deal of confusion among developers attempting to understand the JSON-LD document.