@Override
    public void characters(final char[] ch, final int start, final int length) throws SAXException {
        if (depth > 0) {
            super.characters(ch, start, length);
        }
    }
@param ch     the characters from the XML document
@param start  the start position in the array
@param length the number of characters to read from the array
stroom-headless/src/main/java/stroom/headless/HeadlessFilter.java