rsvg_node_group_pack (RsvgNode * self, RsvgNode * child)
{
    g_ptr_array_add (self->children, child);
    child->parent = self;
}
rsvg_node_group_pack (RsvgNode * self, RsvgNode * child)
{
    g_ptr_array_add (self->children, child);
    child->parent = self;
}