Oh , oh ! You mean , in the slot ?
Mm - hmm.
Um , no , it 's like X - sc it 's  it 's like I was thinking of type constraints but X - schema , well it obviously has to be an X - schema. " Agent " , I mean , the  the performer of the X - schema , that s depends on the X - schema. You know , and I  in general it would probably be , you know
So the difference is basically whether you thought it was obvious what the possible fillers were.