@Override
    public void endPrefixMapping(final String prefix) throws SAXException {
        super.endPrefixMapping(prefix);

        cb.append(END_PREFIX_MAPPING);
        cb.append(prefix);

        writeln(cb);
    }
@param prefix the prefix that was being mapped. This is the empty string
              when a default mapping scope ends.
@throws org.xml.sax.SAXException the client may throw an exception during processing
@see #startPrefixMapping
@see #endElement
stroom-pipeline/src/main/java/stroom/pipeline/filter/TestSAXEventFilter.java