class adv_PP
{
    <: adv_modifier;
    node Root : [cat: PP];
    Adv < Foot;
    node(Incise).bot.incise_kind = value(dash|par);
    node(Adv).bot.adv_kind = value(~très);
    %% no argument in this case
    desc.@kind0 = value(-);
}