I am not a native speaker so I would like to know what terms are suitable to describe
to the user, in computer applications where user can annotate text like PDF readers
(notes appear as yellow boxes near words and show text when clicked, while 2,3,4 appear as text decorations).
I feel that underlining, highlighting and striking are sort of acts of annotation too. I may be wrong.
I see that most applications that enable the user to annotate text, like PDF readers, collectively name notes (like sticky yellow "adhesive" notes) and decorations (like underlining) as "annotations".
Many tutorials or wiki entries about annotating a book use annotations for both types of items.
Maybe it is because many programmers are not native English speakers. Or maybe it is correct to call notes and decorations together annotations. I do not know, I am asking here.
In other languages, in fact, words like annotate encompass also underlining or drawing arrows, circles, writing marginalia and so on, in addition to create and attach or link to notes, as a whole process that goes along study.
Are 2,3,4 annotations? If yes, are they annotations also when 1 is explicitly called notes? (important)
If an app is able to manage 1,2,3,4, how would I describe 1 and 2,3,4 as two separate categories to the user (like notes vs annotations)?
I feel it is also ugly to call 2,3,4 text-decorations.