@Override
    public void ignorableWhitespace(char[] ch, int start, int length)
            throws SAXException {
        if (contentHandler == null) {
            return;
        }
        contentHandler.ignorableWhitespace(ch, start, length);
    }
@param ch
@param start
@param length
@throws SAXException
@see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
src/nu/validator/servlet/OutlineBuildingXMLReaderWrapper.java