class modifier_on_vmod
{
    + s_adj_pos;
    node(Root).cat = value(VMod);
    node(Foot).bot.position = value(post|postsubj);
    %% we want to test the compatibiity of cat
    %% but not instantiate Foot.bot.cat
    %% hence the use of ==
    Modifier +
         node(Foot).dummy.cat == node(Foot).bot.cat
         ;
    % node(Foot).dummy.cat = node(Foot).bot.cat;
    node(Foot).bot.cat = value(CS|PP|N2|adv|S|advneg|pres|que|pro);
    node(Root).top.cat = value(CS|PP|N2|adv|S|advneg|pres|que|pro);
    node(Root).bot.position = node(Root).top.position;
    node(Root).bot.number = node(Root).top.number;
    node(Root).bot.gender = node(Root).top.gender;
    node(Root).bot.person = node(Root).top.person;
    %% it seems we can assume the following
    node(Root).bot = node(Root).top;
}