> > Could you elaborate? To what do these labels refer? As a recent example, I got reviewers' comments for a submitted paper and need to write a response that refers to the revised paper. I marked reviewers' comments as 'comment_1_1', 'comment_3_10' etc and inserted them as labels to my manuscript. One paragraph might have several labels from the same or different reviewers. These labels make it easy for me to know where my manuscript needs modification, and more importantly, to refer to them from my response (using the xr package, something I plan to support in 1.7.x).
The whole point is that a paragraph, even it occupies a single page, may have more than one logically meaningful labels. Bo