code: public boolean isSpecified (String uri, String localName)
      {
      int index = getIndex (uri, localName);
  
      if (index < 0)
          throw new IllegalArgumentException (
          "No such attribute: local=" + localName
          + ", namespace=" + uri);
      return specified [index];
      }
docs: Returns the current value of an attribute's "specified" flag.
  
  @param uri The Namespace URI, or the empty string if
  the name has no Namespace URI.
  @param localName The attribute's local name.
  @return current flag value
  @exception java.lang.IllegalArgumentException When the
  supplied names do not identify an attribute.