@Override
        public <V> boolean requiresVersion(final V version) {
            return false;
        }
GraphML does not have a version and therefore always returns false. This default return also makes sense
because GraphML does not use custom {@link IoRegistry} instances anyway which is the primary reason for
calling this method by a graph provider.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphml/GraphMLIo.java