class whpro_modifier 
{
    %% some PP or adv  modifiers may appear as whpro like où
    %% example: je le livre où ?
    %% example: je fais comment ?
    <: simple_categories;
    desc.ht = value([arg0: @emptyarg_fs,arg1: @emptyarg_fs,arg2: @emptyarg_fs]);
    - s_modifier; Modifier = whpro; Anchor = whpro;
    node(Foot).dummy.cat = value(pro);
    node whpro : [cat:pri, lex: où|quand|comment|combien];
    node(Root).cat = value(S|VMod);
}