1. NEED TO GO THROUGH A FILTER.
conf(@conid=x1)[
    title(@contitle=x2){functional},
    date(@year=x3,@month=x4,@day=x5){functional},
    editor[
        person(@ediperid=x6)[
            name(@fn1=x7,@ln1=x8){functional},
            email(@email1=x9){functional},
            phone(@phone1=x10){functional}]]]
:-
Person(Y1),Conference(Y2),[orgCommittee:programCommittee](Y2,Y1),
ln1 in {SubClassNamesOf(Person)},fn1 in {SubClassNamesOf(Person)},date(Y2,x3),
email(Y1,x9),phone(Y1,x10),number(Y2,x1),
id(Y1,x6),eventTitle(Y2,x2).