@Override
    public StringBuilder toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent) {
        return string.append(name);
    }
An opaque name in a ranking expression. This is used to represent names passed to the context
and interpreted by the given context in a way which is opaque to the ranking expressions.

@author Simon Thoresen Hult
searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/NameNode.java