class _special_cleft_extraction 
{
    %% some cleft constructions remove the main verbs
    %% example: c'est lui le chef
    %% standing for "c'est lui qui est le chef"
    %% example: c'est le chat le coupable
    %% Also work for reversed construction
    %% example: le chef, c'est lui.
    %% desc.ht = value([arg0: @emptyarg_fs,arg1: @emptyarg_fs,arg2: @emptyarg_fs]);
    S >> N1;
    node S : [cat: S, id: S, bot: [sat: -]];
    node(S).top.extraction = value(-);
    node(S).bot.extraction = value(cleft);
    node(S).bot.gender = node(S).top.gender;
    node(S).bot.number = node(S).top.number;
    node(S).bot.person = node(S).top.person;
    node(S).bot.mode = node(S).top.mode;
    node(S).bot.tense = node(S).top.tense;
    node(S).bot.neg = node(S).top.neg;
    node(S).bot.wh = node(S).top.wh;
    node(S).bot.inv = node(S).top.inv;
    node N1: [cat: N2, id: subject, type: subst, top:[ sat: + ]];
    node N2: [cat: N2, id: comp, type: subst, top:[ sat: + ]];
    N2 +
        node(N1).top.person = node(N2).top.person,
        node(N1).top.gender = node(N2).top.gender,
        (
            node(N1).top.number = node(N2).top.number
            |
            node(N1).top.number = value(pl),
            node(N1).top.person = value(2),
            node(N2).top.number = value(sg)
         );
}