public void writeCharacters(String text) throws XMLStreamException {
            state = SEEN_DATA;
            super.writeCharacters(text);
        }
Print indentation for the current level.

@exception org.xml.sax.SAXException
             If there is an error writing the indentation characters, or if
             a filter further down the chain raises an exception.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphml/GraphMLWriterHelper.java