// abstract syntax for a col signature

public class colsig
{
  public String id;
  public ctype type;
  public colsig next;  /* linked list */

  public colsig(String i, ctype t, colsig n)
    { id = i;  type = t;  next = n; }
  public int length()
    {
	int ax = 0;
	for(colsig i=this;i!=null;i=i.next) ax++;
	return ax;
    } // length

}