I want to make visible and editable, in the side-panel of the Caja file manager, gvfs annotation from selected file (like it is now with current catolog).
Unfortunately, I don't even know how to start or where I have to start looking for solutions. Any ideas?

I really appreciate file's tags, emblems and annotations, so I don't have to create special catalogs with special text file to describe comment.
It will be great to extend it (metadata::annotation: gvfs gvfs-info gvfs-set-attribute) with IPTC, XMP...

Any ideas?