code: private boolean tryWhitespace() throws SAXException, IOException {
          char c;
          c = readCh();
          if (isWhitespace(c)) {
              skipWhitespace();
              return true;
          } else {
              unread(c);
              return false;
          }
      }
docs: Return true if we can read some whitespace.
  <p>
  This is simply a convenience method.
  <p>
  This method will push back a character rather than an array whenever
  possible (probably the majority of cases).
  
  @return true if whitespace was found.