[Inkscape-devel] forward declarations janitorial task

hi list.

I'm taking a look at the janitorial task, specially to the forward declaration in the wiki[1]. But there is something i'm not sure about. You can use the forward declaration only if you're using the class as a pointer and without using any of its functions/attributes ? or is it just when using the class as a pointer ?

for example, in attribute-rel-util.h, i can get rid of the xml/node.h include, but sp-css-attr.h doesn't seem to work.

Am I missing something ?

[1] http://wiki.inkscape.org/wiki/index.php/Janitorial_tasks#Improving_headers_f...