style properties

["Matthias Clasen" <Matthias Clasen poet de>]

While looking into property documentation I came across the notion
of style properties. Can somebody explain these a bit ?

How are they different from ordinary properties ? (I have the suspicion 
that themes are relevant here)
Should they be documented ? 
If yes, it seems that we're missing a bit of reflection API in this area,
namely

gtk_widget_class_find_style_property
gtk_widget_class_list_style_properties

analogous to what we have for child properties. Adding these
would allow me to cover style properties in gtkdoc-scangobj.

Comments ?