@Override
    public void endPrefixMapping(final String prefix) throws SAXException {
        handler.endPrefixMapping(prefix);
        super.endPrefixMapping(prefix);
    }
@param prefix the prefix that was being mapped. This is the empty string
              when a default mapping scope ends.
@throws SAXException the client may throw an exception during processing
@see #startPrefixMapping
@see #endElement
@see AbstractXMLFilter#endPrefixMapping(String)
stroom-pipeline/src/main/java/stroom/pipeline/writer/XMLWriter.java