class prep_in_comp
{
    <: prep;
    node Root : [cat: comp, id:comp, type: std, bot: [real: PP]];
    PP +
        node(PP).top.real = value(adj),
        node(Root).bot.person = node(PP).top.person,
        node(Root).bot.number = node(PP).top.number,
        node(Root).bot.gender = node(PP).top.gender
        |
        node(PP).top.real = value(~adj),
        node(Root).bot.person = value(-),
        node(Root).bot.number = value(-),
        node(Root).bot.gender = value(-)
        ;
    Root >> PP;
}