@Override
    public void fire(final ContentHandler handler) throws SAXException {
        handler.startDocument();
    }
Fires a stored SAX event at the supplied content handler.

@param handler The content handler to fire the SAX event at.
@throws SAXException Necessary to maintain the SAX event contract.
@see Event#fire(org.xml.sax.ContentHandler)
stroom-pipeline/src/main/java/stroom/pipeline/xml/event/simple/StartDocument.java