8.51. droplisten(integer, integer, integer)

    declare
    	p_li_origin		alias for $1;
    	p_li_provider	alias for $2;
    	p_li_receiver	alias for $3;
    begin
    	perform dropListen_int(p_li_origin, 
    			p_li_provider, p_li_receiver);
    	
    	return  createEvent ('_schemadoc', 'DROP_LISTEN',
    			p_li_origin::text, p_li_provider::text, p_li_receiver::text);
    end;