code: public void setURI (int index, String uri)
      {
      if (index >= 0 && index < length) {
          data[index*5] = uri;
      } else {
          badIndex(index);
      }
      }
docs: Set the Namespace URI of a specific attribute.
  
  @param index The index of the attribute (zero-based).
  @param uri The attribute's Namespace URI, or the empty
  string for none.
  @exception java.lang.ArrayIndexOutOfBoundsException When the
  supplied index does not point to an attribute
  in the list.