code: private void skipWhitespace() throws SAXException, IOException {
          // OK, do it the slow way.
          char c = readCh();
          while (isWhitespace(c)) {
              c = readCh();
          }
          unread(c);
      }
docs: Skip whitespace characters.
  
  <pre>
  [3] S ::= (#x20 | #x9 | #xd | #xa)+
  </pre>