[cairo] pdf mouseover or link effect?

[Daniel Goldman]

Can cairo produce "mouseover effect" or "link effect" in pdf output?

The mouseover effect would display a "tooltip" when the mouse moves over a 
defined area.
The link effect would bring up a web page in a browser when the user clicks on 
defined area.

I saw some previous discussion (below), so my guess is this is not implemented.

http://lists.cairographics.org/archives/cairo/2007-November/012026.html
http://lists.freedesktop.org/archives/cairo/2008-February/012986.html

Thanks,
Daniel