code: public void setType (int index, String type)
      {
      if (index >= 0 && index < length) {
          data[index*5+3] = type;
      } else {
          badIndex(index);
      }
      }
docs: Set the type of a specific attribute.
  
  @param index The index of the attribute (zero-based).
  @param type The attribute's type.
  @exception java.lang.ArrayIndexOutOfBoundsException When the
  supplied index does not point to an attribute
  in the list.