@Override
        public void characters(final char[] ch, final int start, final int length) throws SAXException {
            super.characters(ch, start, length);
            saxDocumentSerializer.characters(ch, start, length);
        }
A proof of concept for https://github.com/gchq/stroom/issues/1945
Trying to prove that we can generate a fast infoset vocab
for some xml and then append to it. This is to reduce the volume of data
stored in the LMDB ref data store.
stroom-pipeline/src/test/java/stroom/pipeline/refdata/TestFastInfosetVocab.java