Is there a way Spotlight indexes my Skim bookmarks/notes ? I find Skim is a great pdf file reader and want to spend a great deal of time adding notes and bookmarks to some of the pdf files I have. 

I know Spotlight indexes pdf files but it doesn't seem to index my Skim bookmarks. 
(I just created a bookmark in Skim and search for that bookmark in Spotlight. No results).

I may force Spotlight to index net.sourceforge.skim-app.skim.bookmarks.plist (it is where bookmarks are stored) ?

What do you think ? 
Thanks in advance.
The solution I've found+tested:

In Skim:


  
  File - Export -> Skim notes.
  You now have one .skim file with your annotations only + their pages number. 
  


Skim notes are indexed by Spotlight.

Source: here