? document collaboration - 'inline' comments ?

[b3zra1y]

Wondering if there are any existing capabilities that have been developed for Alfresco for the following scenario:
- a registered user can provide comments 'right next to' a particular section of a document or PDF (e.g., a paragraph).
- these comments might appear in something like a sticky note or a text bubble so that they're intuitive and readily visible (or expandable)
- another user can reply to or refine that comment and so a kind of context-specific discussion thread is created.
I've see sites such as 'webnotes' or 'crocodoc' that do this kind of thing.

I've been away from the Alfresco community for a couple of years, so am not sure of the latest state of things on this front.
Thanks in advance for any input…

[_sax]

Both offer cool features, of which existence I didn't know. But Alfresco doesn't offer anything like this, it has tags that are easily manageable with http://yourserver:8080/share though, and then there's the Sharepoint support that allows you to work from within MS Office, but that doesn't work for webpages and PDFs of course.
Do these tools work, if I open a local PDF file, annotate something in it and then send this file to someone else? Or is this limited to everything that is displayed inside your browser and stored on a server?