code: public void normalizeDefault()
      {
          String val = mDefValue.getValue();
          if (val.length() > 0) {
              char[] cbuf = val.toCharArray();
              String str = StringUtil.normalizeSpaces(cbuf, 0, cbuf.length);
              if (str != null) {
                  mDefValue.setValue(str);
              }
          }
      }
docs: Method called to do initial normalization of the default attribute
  value, without trying to verify its validity. Thus, it's
  called independent of whether we are fully validating the document.